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<article id="post-流浪id引发的精度丢失思考" class="article article-type-post article-index" itemscope itemprop="blogPost">
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<h1 itemprop="name">
<a class="article-title" href="/2019/12/20/流浪id引发的精度丢失思考/">流浪id引发的精度丢失思考</a>
</h1>
<a href="/2019/12/20/流浪id引发的精度丢失思考/" class="archive-article-date">
<time datetime="2019-12-20T11:05:32.000Z" itemprop="datePublished"><i class="icon-calendar icon"></i>2019-12-20</time>
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<h3 id="起因"><a href="#起因" class="headerlink" title="起因"></a>起因</h3><p>这周开发一个功能提测，测试和我说一个页面跳转不正常。咦，我看了一下，这个页面怕是三个月没有动过了，而且线上一直没有问题，应该是后端动了那块内容导致的问题，查了一下，发现问题 id 在传输过程中发现了问题 id 发生了变化，例如发生问题的 id22280242127187968，在组件中变成了 22280242127187970，就是因为精度丢失导致的。</p>
<h3 id="解决"><a href="#解决" class="headerlink" title="解决"></a>解决</h3><p>因为问题 id 从页面传输给组件时，组件接收 id 时的 type 定义为 Number，从而导致了精度丢失问题，把接收类型改为 String 就解决了这个问题，那么来好好捋一捋为什么接收类型是 Number 就会造成这个问题</p>
<h3 id="原因"><a href="#原因" class="headerlink" title="原因"></a>原因</h3><p>翻开 JavaScript 权威指南 34 页，原因写得清清楚楚：JavaScript 不区分整数值和浮点数值。JavaScript 中的所有数字均用浮点数值表示。</p>
<p>按照 JavaScript 中的数字格式，能够表示的整数范围是从-9007199254740992 ~ 9007199254740992(即 2 的 53 次方的正负区间)。如果使用了超过此范围的整数，则无法保证低位数字的精度。让我们再来看看我们使用的 id 是什么，22280242127187968，是不是超过了这个范围呢。我们可以使用 Number.MAX_SAFE_INTEGER 这个常量快速获取最大安全整数值，Number.MIN_SAFE_INTEGER 获取最小安全常量值。</p>
<p>当然，当我们引入 BigInt 这个基本类型时候，就能解决这个问题。</p>
<h3 id="另外"><a href="#另外" class="headerlink" title="另外"></a>另外</h3><p>不知道大家有没有碰到过这么一个经典的问题：</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div></pre></td><td class="code"><pre><div class="line">0.1 + 0.2 !== 0.3</div></pre></td></tr></table></figure>
<p>这种也是精度丢失，<a href="https://juejin.im/post/5b20cbb051882513ac20354f" target="_blank" rel="external">可以查看掘金这篇文章</a></p>
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<a class="article-more-a" href="/2019/12/20/流浪id引发的精度丢失思考/">展开全文 >></a>
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<article id="post-一些JavaScript的调试技巧" class="article article-type-post article-index" itemscope itemprop="blogPost">
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<h1 itemprop="name">
<a class="article-title" href="/2018/08/11/一些JavaScript的调试技巧/">一些JavaScript的调试技巧</a>
</h1>
<a href="/2018/08/11/一些JavaScript的调试技巧/" class="archive-article-date">
<time datetime="2018-08-11T07:35:10.000Z" itemprop="datePublished"><i class="icon-calendar icon"></i>2018-08-11</time>
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<p>总结了一部分所知的和了解到的调试技巧，方便大家开发时用到，尽管 JavaScript 调试起来比较麻烦，但只要了解部分技巧，还是能够节省部分时间和快速定位问题的</p>
<h4 id="1-debugger"><a href="#1-debugger" class="headerlink" title="1. debugger"></a>1. debugger</h4><p>debugger 个人感觉应该是最好用的调试，简单暴力，想怎么用就怎么用,在代码中注入比较方便。示例：</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div></pre></td><td class="code"><pre><div class="line">if (a === 6) {</div><div class="line"> debugger;</div><div class="line">}</div></pre></td></tr></table></figure>
<h4 id="2-利用-console-table-把对象输出成表格"><a href="#2-利用-console-table-把对象输出成表格" class="headerlink" title="2. 利用 console.table 把对象输出成表格"></a>2. 利用 console.table 把对象输出成表格</h4><p>利用 console.table 可以方便的把数组中的每个对象用表格的方式输出出来，而不必用 console.log 一个个去输出。示例：</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div></pre></td><td class="code"><pre><div class="line">const a = [</div><div class="line"> { a: 1, b: 2, c: 3 },</div><div class="line"> { a: 4, b: 5, c: 6 },</div><div class="line"> { a: 7, b: 8, c: 9 }</div><div class="line"> ];</div><div class="line"></div><div class="line"> console.table(a);</div></pre></td></tr></table></figure>
<p><img src="https://ws1.sinaimg.cn/large/006tNbRwgy1fu5txgtjbgj30t10390st.jpg" alt=""></p>
<h4 id="3-格式化代码方便阅读"><a href="#3-格式化代码方便阅读" class="headerlink" title="3. 格式化代码方便阅读"></a>3. 格式化代码方便阅读</h4><p>可能我们在查看某些项目代码是发现 source map 没有部署到服务器上，代码看上去没有一点头绪，不急，我们强大的 Chrome 浏览器可以帮助我们格式化代码。</p>
<h6 id="调试前："><a href="#调试前：" class="headerlink" title="调试前："></a>调试前：</h6><p><img src="https://ws2.sinaimg.cn/large/006tNbRwgy1fu5uboue1sj30i407nmyt.jpg" alt=""></p>
<h6 id="调试后："><a href="#调试后：" class="headerlink" title="调试后："></a>调试后：</h6><p><img src="https://ws2.sinaimg.cn/large/006tNbRwgy1fu5ucvon0tj30i107hgn0.jpg" alt=""></p>
<p>左下角的{}就是调试按钮，是不是可读性好了很多。</p>
<h4 id="4-快速找到调试函数"><a href="#4-快速找到调试函数" class="headerlink" title="4. 快速找到调试函数"></a>4. 快速找到调试函数</h4><p>这是对 debugger 调试方式的延伸。当我们在函数中设置断点时，通常有两种方法：</p>
<ol>
<li>查看器中找到代码并设置断点</li>
<li>在代码中添加 debugger</li>
</ol>
<p>现在有种不常用的方式，当我们知道函数名字的时候，在控制台使用 debug(funcName)，代码会在停止在进入这里指定的函数时。但它不能用于局部函数或匿名函数。</p>
<p><img src="https://ws2.sinaimg.cn/large/006tNbRwgy1fu5uqtnerfj30fh01uglk.jpg" alt=""></p>
<h4 id="5-用-console-time-和-console-timeEnd-测试代码执行时间"><a href="#5-用-console-time-和-console-timeEnd-测试代码执行时间" class="headerlink" title="5.用 console.time() 和 console.timeEnd() 测试代码执行时间"></a>5.用 console.time() 和 console.timeEnd() 测试代码执行时间</h4><p>当你想知道某些代码的执行时间的时候这个工具将会非常有用，特别是当你定位很耗时的循环的时候。</p>
<p><img src="https://ws4.sinaimg.cn/large/006tNbRwgy1fu5v06zt4fj30tr04rt96.jpg" alt=""></p>
<h4 id="6-查看具体的函数调用和它的参数"><a href="#6-查看具体的函数调用和它的参数" class="headerlink" title="6. 查看具体的函数调用和它的参数"></a>6. 查看具体的函数调用和它的参数</h4><p>往往我们调用一个函数会忽略掉参数值和个数，那么我们其实可以在控制台监控我们想要监控的函数，方便我们去查看哪些参数传到了函数中。<br>示例：</p>
<p><img src="https://ws1.sinaimg.cn/large/006tNbRwgy1fu5vd8xr9pj30t80b3q58.jpg" alt=""></p>
<h4 id="7-获取函数的堆栈轨迹信息"><a href="#7-获取函数的堆栈轨迹信息" class="headerlink" title="7. 获取函数的堆栈轨迹信息"></a>7. 获取函数的堆栈轨迹信息</h4><p>函数被调用时，就会被加入到调用栈顶部，执行结束之后，就会从调用栈顶部移除该函数。<br>当我们从进入页面到展示页面，或者执行一个点击事件，有时候很难完整的了解到底发生了什么以及什么时候发生的。所以我们得调用函数这种执行方式来调试。</p>
<p><img src="https://ws1.sinaimg.cn/large/006tNbRwgy1fu5wirjmdij30cv0bg0tc.jpg" alt=""></p>
<h5 id="toDo"><a href="#toDo" class="headerlink" title="toDo"></a>toDo</h5><p>如果还有其他更好的调试方式或者上述有什么写的不对的地方，欢迎交流。</p>
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<article id="post-JavaScript策略模式简单思考" class="article article-type-post article-index" itemscope itemprop="blogPost">
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<a class="article-title" href="/2018/06/11/JavaScript策略模式简单思考/">JavaScript策略模式简单思考</a>
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<a href="/2018/06/11/JavaScript策略模式简单思考/" class="archive-article-date">
<time datetime="2018-06-11T01:46:28.000Z" itemprop="datePublished"><i class="icon-calendar icon"></i>2018-06-11</time>
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<p>前提： 最近在做医生会员卡的相关 case，涉及到了一些卡的属性判断，结合以前看书时了解到的一些基本知识和网上查找到的相关资料，就简单说一下自己了解到的和掌握的一些基本知识。</p>
<p>网上找一下关于策略模式的定义：<br><strong>策略模式(Strategy Pattern)：定义一系列算法，将每一个算法封装起来，并让它们可以相互替换。策略模式让算法独立于使用它的客户而变化，也称为政策模式(Policy)。</strong></p>
<h3 id="问题"><a href="#问题" class="headerlink" title="问题"></a>问题</h3><p>医生卡有卡相关的属性，表示这张卡是年卡，月卡，还是季卡等等，每种类型的卡都对应不同的权限等等，虽然这个 case 大部分情况判断都放在了后端去判断，但是当我们需要根据一些字段去区分卡属性对应不同操作的时候，我们就得定一系列对应的策略不解决不同状态对应的不同问题。</p>
<h3 id="为什么要使用策略模式"><a href="#为什么要使用策略模式" class="headerlink" title="为什么要使用策略模式"></a>为什么要使用策略模式</h3><p>那么为什么要使用策略模式，策略模式的使用适合场景又是怎么样呢？我想的是如果一个对象有很多的行为，如果不用恰当的模式，这些行为就只好使用多重的条件选择语句来实现，这样可能就会造成代码的冗余和后期的不好维护。</p>
<h4 id="对于前端"><a href="#对于前端" class="headerlink" title="对于前端"></a>对于前端</h4><h6 id="最简单的实现"><a href="#最简单的实现" class="headerlink" title="最简单的实现"></a>最简单的实现</h6><figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div></pre></td><td class="code"><pre><div class="line"><!--对于情况1--></div><div class="line">function test1 () {</div><div class="line"> return something1;</div><div class="line">}</div><div class="line"></div><div class="line"><!--对于情况二--></div><div class="line">function test2() {</div><div class="line"> return something2;</div><div class="line">}</div><div class="line"></div><div class="line"><!--对于情况3--></div><div class="line">function test3() {</div><div class="line"> return something3;</div><div class="line">}</div></pre></td></tr></table></figure>
<p>这样的虽然写起来相当简单，但是当判断条件一增多，很不方便管理，而且可读性很差，更优化一点用 switch case 可能方便阅读和理解：</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div></pre></td><td class="code"><pre><div class="line">function cardStatus (type) {</div><div class="line"> switch(type) {</div><div class="line"> case 'test1':</div><div class="line"> 情况1</div><div class="line"> break;</div><div class="line"> case 'test2':</div><div class="line"> 情况2</div><div class="line"> break;</div><div class="line"> case 'test3':</div><div class="line"> 情况3</div><div class="line"> break;</div><div class="line"> default:</div><div class="line"> break;</div><div class="line"> }</div><div class="line">}</div></pre></td></tr></table></figure>
<p>大部分情况我可能就是直接使用 switch case 去解决问题了。</p>
<h5 id="采用策略对象的形式"><a href="#采用策略对象的形式" class="headerlink" title="采用策略对象的形式"></a>采用策略对象的形式</h5><p>当我制定了一个策略对象，我就不需要在其他很多地方去频繁地调用一些状态判断和卡的属性，因为卡的一些基本字段是不会有什么改变的，那么我们对此进行封装好，最终我们得到的就是一些我们最终想到得到的结果，而不用去关心一些卡的属性判断。</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div><div class="line">20</div><div class="line">21</div><div class="line">22</div></pre></td><td class="code"><pre><div class="line">const cardInfo = (p1, p2) => {</div><div class="line"></div><div class="line"></div><div class="line"> const cardFunc = {</div><div class="line"> yearFunc: (param1) => {</div><div class="line"> <!--dosomething1--></div><div class="line"> },</div><div class="line"> monthFunc: (param1) => {</div><div class="line"> <!--dosomething2--></div><div class="line"> },</div><div class="line"> quarterFunc: (param1) => {</div><div class="line"> <!--dosomething3--></div><div class="line"> },</div><div class="line"> isExpired: () => {</div><div class="line"> <!--dosomething4--></div><div class="line"> }</div><div class="line"> }</div><div class="line"></div><div class="line"> return (p1, p2) => {</div><div class="line"> return cardFunc[p1] && cardFunc[p1](p2)</div><div class="line"> }</div><div class="line">}</div></pre></td></tr></table></figure>
<p>我在极客学院也看到一篇文章，分享一下: <a href="http://wiki.jikexueyuan.com/project/javascript-depth-understanding/model-design-nine.html" target="_blank" rel="external">设计模式之策略模式</a></p>
<p>可能理解尚浅，有点偏差，还望见谅。</p>
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<a class="article-title" href="/2018/02/23/支付宝小程序开发填坑/">支付宝小程序开发填坑</a>
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<time datetime="2018-02-23T03:15:41.000Z" itemprop="datePublished"><i class="icon-calendar icon"></i>2018-02-23</time>
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<h4 id="开发者工具的坑"><a href="#开发者工具的坑" class="headerlink" title="开发者工具的坑"></a>开发者工具的坑</h4><ol>
<li>细线在某些机型上展示不出来（比如小米的一些小屏手机）</li>
<li>scroll-view 不能设置百分比，一定要设置一个具体的高度才会触发触底事件</li>
<li>api getsysteminfo</li>
<li>react 式的开发模式</li>
<li>极差的开发体验</li>
<li>数据的难以捕捉</li>
<li>不能自定义组件</li>
</ol>
<h4 id="区别于微信小程序"><a href="#区别于微信小程序" class="headerlink" title="区别于微信小程序"></a>区别于微信小程序</h4><ol>
<li>没有自定义组件，不支持组件式开发，是被支付宝开发社区吐槽最多的问题，若要复用组件和方法，考虑抽出公共方法和使用继承写法</li>
<li>react 的开发方式，和开发微信小程序有一些不同的地方，比如开发 template 时可能没有一个父标签，在循环调用这个模板时会报错，在使用微信小程序对应的 wxparse 富文本解析转换为 aliparse 时，记得把 bindtap 转换为 onTap 方法</li>
<li>问题详情页面， 相同的代码在微信小程序上下拉刷新没有问题，在支付宝小程序上出现白屏问题，而且只有在 ios 设备上才会出现问题，IDE 无法复现，没有报错信息，只能一步步删除代码来确定问题，最后换种实现方式避免这种问题出现，具体原因仍需排查</li>
</ol>
<h4 id="开发体验"><a href="#开发体验" class="headerlink" title="开发体验"></a>开发体验</h4><ol>
<li>测试的相当不便性，引用开发社区的一句话，测试请以真机为主</li>
<li>上传代码的不方便性，上传代码把 node_modules 的大小也算进去了，导致每次上传都需要删除 node_modules</li>
<li>细线在某些小屏手机上会有展示不出的问题</li>
</ol>
<h4 id="组件坑"><a href="#组件坑" class="headerlink" title="组件坑"></a>组件坑</h4><ol>
<li>scroll-view 的使用，如果只用 onScrollToLower 这个方法的话，不能设置百分比，只能设置一个固定高度 （例子：医生 profile 页的评价列表，虽然根据支付宝那边的要求砍掉了，吐槽一下）</li>
</ol>
<h4 id="不一致"><a href="#不一致" class="headerlink" title="不一致"></a>不一致</h4><ol>
<li>fill 方法也不支持</li>
</ol>
<h4 id="优点"><a href="#优点" class="headerlink" title="优点"></a>优点</h4><ol>
<li>说完缺点，也不能不说优点吧。嗯。。。这个支付宝小程序，能调用某些支付宝相关的接口，大概只有这个优点了。</li>
</ol>
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<article id="post-JS知识点记录" class="article article-type-post article-index" itemscope itemprop="blogPost">
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<a class="article-title" href="/2017/10/14/JS知识点记录/">JS知识点记录</a>
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<p><strong>1. 基础类型对象有哪些？null 是对象嘛，原始数据类型和复杂类型存储有什么区别。</strong></p>
<p>基础类型对象：undefined，null，boolean, string, number,symbol</p>
<p>不是， 原始类型对象存储在栈内存当中，占用空间小，大小固定，属于被频繁使用数据，所以放在栈中存储，引用对象存储在堆内存当中,占据空间大，大小不固定</p>
<p><strong>2. typeof 是否正确判断类型? instanceof 呢？ instanceof 的实现原理是什么？</strong></p>
<p>typeof 除了 null 都能判断基本数据类型，但是不能判断对象，typeof 一个函数可以输出 function，除此之外全是 object。<br>instanceof 可以判断复杂数据类型，但是不能判断基本数据类型<br>instanceof 是通过原型链判断的，a instanceof b,在 a 的原型链中层层查找，是否有原型等于 b.prototype,如果一直找到原型链的顶端，仍然不等于 b.prototype,那么返回 false，不然返回 true。</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div></pre></td><td class="code"><pre><div class="line">// L instanceof R</div><div class="line">function instance_of(L, R) {//L 表示左表达式，R 表示右表达式</div><div class="line"> var O = R.prototype;// 取 R 的显式原型</div><div class="line"> L = L.__proto__; // 取 L 的隐式原型</div><div class="line"> while (true) {</div><div class="line"> if (L === null) //已经找到顶层</div><div class="line"> return false;</div><div class="line"> if (O === L) //当 O 严格等于 L 时，返回 true</div><div class="line"> return true;</div><div class="line"> L = L.__proto__; //继续向上一层原型链查找</div><div class="line"> }</div><div class="line">}</div></pre></td></tr></table></figure>
<p><strong>3. for of , for in 和 forEach,map 的区别 </strong></p>
<p>for of: 具有 iterator 接口，就可以用 for of 循环遍历，可以中断循环<br>for in: 遍历对象自身的和继承的可枚举的属性, 不能直接获取属性值，可以中断循环<br>forEach：只能遍历数组，没有返回值，不能中断循环<br>map: 只能遍历数组，返回修改后的数组，不能中断循环</p>
<p>PS: Object.keys()：返回给定对象所有可枚举属性的字符串数组。</p>
<p><strong>4. 如何判断一个变量是不是一个数组</strong></p>
<ul>
<li>Array.isArray</li>
<li>instanceof Array</li>
<li>Object.prototype.toString.call –> 如果值是[object Array],说明是数组</li>
</ul>
<p><strong>5. 类数组和数组的区别是什么</strong></p>
<p>不具有数组所具有的方法，具有 length 属性。<br>类数组是个普通对象，真实的数组是 Array 类型<br>常见的类数组有： 函数的 arguments，dom 对象列表，jquery 对象</p>
<p>类数组可以转换为数组：</p>
<ol>
<li>Array.from(arrayLike)</li>
<li>[…arrayLike]</li>
<li>Array.prototype.slice.call(arrayLike, start)</li>
</ol>
<p>任何定义了 iterator 接口的对象，都能用扩展运算符转为真正的数组<br>Array.from 方法用户将两类对象转化为数组，类似数组的对象和具有 iterator 的对象</p>
<p><strong>6. == 和===有什么区别</strong><br>=== 不需要进行类型转换，只有类型相同并且值相同，才会返回 true<br>== 如果两者类型不同，需要先进行类型转换：</p>
<ol>
<li>判断两者类型是否相同，如果相同，判断值是否相同</li>
<li>如果两者类型不同，则先进行类型转换</li>
<li>判断比较的值是否是 null 或者 undefined，如果是，返回 true</li>
<li>判断两者类型是否为 string 和 number, 如果是, 将字符串转换成 number</li>
<li>判断其中一方是否为 boolean, 如果是, 将 boolean 转为 number 再进行判断</li>
<li>判断其中一方是否为 object 且另外一方是否为 number，string，symbol，如果是，则将对象转换为原始对象判断</li>
</ol>
<h6 id="判断"><a href="#判断" class="headerlink" title="判断 [] == ![]"></a>判断 [] == ![]</h6><ol>
<li>根据运算符优先级!高于==，所以右边先转换为 false</li>
<li>其中一方是 boolean，转换为 number –> [] == 0</li>
<li>其中一方是 object，另外一方是 number，则[]转换为 number，（空数组转换为 number，值是 0，如果数组中只有一个数字，则转化为那个数字，其它情况，皆为 NaN）</li>
</ol>
<p><strong>7. ES6 中的 class 和 ES5 中的类有什么区别</strong></p>
<ol>
<li>es6 的 class 必须使用 new 调用</li>
<li>es6 的 class 默认使用严格模式</li>
<li>es6 的 class 内部定义的方法都是不可枚举的</li>
<li>es6 class 不存在变量提升</li>
<li>es6 class 子类必须在父类的构造函数中调用 super()，这样才有 this 对象;ES5 中类继承的关系是相反的，先有子类的 this，然后用父类的方法应用在 this 上。</li>
</ol>
<p><strong>8. 数组的哪些 api 会改变原数组</strong><br>会改变的<br>push(数组最后添加元素)/pop(删除最后一个)/shift(删除第一个)/unshift(添加到开头)/reverse(反转)/sort(排序)/fill(填充)/splice(通过删除或者替换或者新增元素来改变原数组)/copyWithin(复制数组的一部分到数组的另一个位置)<br>不会改变的<br>find/findindex/every(判断数组中所有元素是否通过某个函数的测试)/map/forEach/slice(切割)/filter/entries/reduce</p>
<p><strong>9. var、let、const 的区别是什么</strong></p>
<ol>
<li>let，const 不存在变量提升</li>
<li>let,const 定义的是块级作用域</li>
<li>let,const 不允许重复声明</li>
<li>let,const 定义的字段如果在声明语句前使用会报错</li>
<li>const 声明的变量，值不能改变，如果声明的是个对象，则不能改变对象的引用地址</li>
</ol>
<p><strong>10. 在 JS 中什么是变量提升？什么是暂时性死区？</strong><br>变量提升就是在声明变量之前就可以使用它，值为 undefined</p>
<p>在代码块内，如果在 let,const 声明变量之前就使用变量，就会抛出错误，这样的话 typeof 就不是一个百分百安全的操作</p>
<p>暂时性死区的本质是，只要一进入当前作用域，变量就已经存在了，但是不可获取和使用，只有声明变量那一行代码出现，才可以获取和使用该变量</p>
<p><strong>11. 如何正确的判断 this？箭头函数的 this 是什么？</strong><br>this 的绑定规则有四种，默认绑定，隐式绑定，显式绑定，new 绑定。</p>
<ol>
<li>函数是否在 new 中调用，如果是，那 this 就是 new 创建的新对象</li>
<li>函数是否通过 apply，call 调用，或者使用了 bind，如果是，那 this 绑定的就是指定的对象</li>
<li>函数是否在某个上下文对象中调用（隐式绑定），如果是的话，this 绑定的就是那个上下文对象</li>
<li>如果以上都不是，那么绑定到 undefined，严格模式下绑定到全局对象</li>
<li>如果把 null 或者 undefined 作为 this 的绑定对象传入 call，apply 或者 bind，这些值在调用时会被忽略，实际应用的是默认绑定规则。</li>
<li>箭头函数没有自己的 this，它的 this 继承与上一层代码块的 this。</li>
</ol>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div><div class="line">20</div><div class="line">21</div></pre></td><td class="code"><pre><div class="line">var number = 5;</div><div class="line">var obj = {</div><div class="line"> number: 3,</div><div class="line"> fn1: (function () {</div><div class="line"> var number;</div><div class="line"> this.number *= 2;</div><div class="line"> number = number * 2;</div><div class="line"> number = 3;</div><div class="line"> return function () {</div><div class="line"> var num = this.number;</div><div class="line"> this.number *= 2;</div><div class="line"> console.log(num);</div><div class="line"> number *= 3;</div><div class="line"> console.log(number);</div><div class="line"> }</div><div class="line"> })()</div><div class="line">}</div><div class="line">var fn1 = obj.fn1;</div><div class="line">fn1.call(null);</div><div class="line">obj.fn1();</div><div class="line">console.log(window.number);</div></pre></td></tr></table></figure>
<p>第一次调用，函数通过 call 调用，但是指定对象时 null，所有 this 指向的对象的全局对象。所以调用结果是 10, 9<br>第二次调用，调用对象是 obj，所以 number 取 3</p>
<blockquote>
<p><strong>12. 词法作用域和 this 的区别。</strong></p>
</blockquote>
<p>词法作用域是在你写代码时变量和块作用域写在哪边决定的<br>this 是由函数被调用时绑定的，this 指向什么，完全取决于函数的调用位置</p>
<blockquote>
<p><strong>13. 谈谈你对 JS 执行上下文栈和作用域链的理解</strong></p>
</blockquote>
<p>js 执行上下文就是当前 js 代码被解析和运行的环境。js 执行上下文栈可以认为是一个存储 js 函数调用的栈结构。</p>
<ol>
<li>js 是单线程，所有的代码都是排队执行</li>
<li>一开始执行全局代码时，创建全局上下文，压入执行栈的顶部</li>
<li>每当进入一个函数的执行，都会创建当前函数的执行上下文，并且把它压入执行栈的顶部，当前函数执行完成后，当前函数的执行上下文出栈，并等待垃圾回收</li>
<li>浏览器的执行引擎总是执行最顶上的执行上下文</li>
<li>全局上下文只有一个，它在浏览器关闭时出栈</li>
</ol>
<p>作用域链就是指寻找目标标识符，如果在当前作用域没有找到，就会向上级作用域继续查找，每次上升一个作用域，直到全局作用域为止。</p>
<blockquote>
<p><strong>14. 什么是闭包？闭包的作用是什么？闭包有哪些使用场景？</strong></p>
</blockquote>
<ol>
<li>闭包是有权访问另外一个函数作用域中变量的函数。创建闭包最常见的方式是在一个函数中创建另外一个函数。</li>
</ol>
<p>闭包的作用：</p>
<ol>
<li>封装私有变量</li>
<li>模拟块级作用域</li>
<li>实现 js 的模块</li>
</ol>
<blockquote>
<p><strong>15. call、apply 有什么区别？call,aplly 和 bind 的内部是如何实现的？</strong></p>
</blockquote>
<ol>
<li>call 和 apply 实现功能相同，但是传参方式不同。</li>
</ol>
<p>function.call(obj1, arg1,arg2,arg3)<br>调用一个函数，有指定的对象，和提供的参数列表<br>function.apply(obj1, [arguments])<br>调用一个函数，有指定的对象，和提供一个数组对象</p>
<ol>
<li>bind 和 call、apply 有一个很重要的区别，一个函数被 call 和 apply 时，会被直接调用，bind 会创建一个新函数。</li>
</ol>
<blockquote>
<p><strong>16. new 的原理是什么？通过 new 的方式创建对象和通过字面量创建有什么区别？</strong></p>
</blockquote>
<h6 id="new"><a href="#new" class="headerlink" title="new"></a>new</h6><ol>
<li>创建一个新对象</li>
<li>这个新对象就会执行原型链接</li>
<li>将构造函数的作用域赋值给新对象，即 this 指向这个新对象</li>
<li>如果函数没有返回新对象，那么 new 表达式中的函数调用就会自动返回这个新对象</li>
</ol>
<blockquote>
<p><strong>17. 谈谈你对原型的理解</strong></p>
</blockquote>
<p>在 JavaScript 中，每当定义一个对象（函数也是对象）,对象都会包含一些预定义的属性，其中每个函数对象都会有一个 prototype 属性，这个属性指向这个函数的原型对象。使用原型对象的好处是所有对象实例共享它包含的属性和方法。</p>
<blockquote>
<p><strong>18. 什么是原型链？【原型链解决的是什么问题？】</strong></p>
</blockquote>
<p>原型链解决的是继承问题。</p>
<p>每个对象拥有一个原型对象，通过 proto 指针指向其原型对象。并从中继承方法和属性,并且原型对象也可能拥有原型，这样一层一层，最终指向 null（Object.prototype.<strong>proto</strong>指向的是 null）。这种关系被称为原型链，通过原型链一个对象可以拥有定义在其他对象中的属性和方法</p>
<blockquote>
<ol>
<li><strong>prototype 和</strong>proto<strong>的区别是什么</strong></li>
</ol>
</blockquote>
<p>prototype 是构造函数的属性。</p>
<p><strong>proto</strong>是每个实例都有的属性，可以访问[[prototype]]对象。</p>
<p>实例的<strong>proto</strong>和构造函数的 prototype 指向同一个对象。</p>
<blockquote>
<ol>
<li><strong>使用 es5 实现一个继承</strong></li>
</ol>
</blockquote>
<figure class="highlight js"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div><div class="line">20</div></pre></td><td class="code"><pre><div class="line"><span class="function"><span class="keyword">function</span> <span class="title">SuperType</span>(<span class="params"></span>) </span>{</div><div class="line"> <span class="keyword">this</span>.name = name;</div><div class="line"> <span class="keyword">this</span>.colors = [<span class="string">"red"</span>, <span class="string">"balck"</span>];</div><div class="line">}</div><div class="line"></div><div class="line">SuperType.prototype.sayName = <span class="function"><span class="keyword">function</span>(<span class="params"></span>) </span>{</div><div class="line"> <span class="built_in">console</span>.log(<span class="keyword">this</span>.name);</div><div class="line">};</div><div class="line"></div><div class="line"><span class="function"><span class="keyword">function</span> <span class="title">SubType</span>(<span class="params">name, age</span>) </span>{</div><div class="line"> SuperType.call(<span class="keyword">this</span>, name);</div><div class="line"> <span class="keyword">this</span>.age = age;</div><div class="line">}</div><div class="line"></div><div class="line">SubType.prototype = <span class="keyword">new</span> SuperType();</div><div class="line">SubType.prototype.constructor = SubType;</div><div class="line"></div><div class="line">SubType.prototype.sayAge = <span class="function"><span class="keyword">function</span>(<span class="params"></span>) </span>{</div><div class="line"> <span class="built_in">console</span>.log(<span class="keyword">this</span>.age);</div><div class="line">};</div></pre></td></tr></table></figure>
<blockquote>
<ol>
<li>什么是深拷贝？深拷贝和浅拷贝有什么区别<strong>？</strong></li>
</ol>
</blockquote>
<p>浅拷贝就是只复制第一层对象，当时引用类型时，实质复制的是其引用，当引用类型发生变化时，拷贝对象的值也会随之发生变化。</p>
<p>深拷贝复制变量值，复制非基本类型的值时，递归至最后一层对象再复制。深拷贝的对象和原对象时完全隔离的，互补影响。</p>
<blockquote>
<ol>
<li>节流和防抖的区别是什么？<strong>节流和防抖的实现</strong></li>
</ol>
</blockquote>
<p>节流和防抖的作用都是防止函数重复触发。区别在于，节流的作用是每隔一段时间触发一次函数，而防抖的作用是假设一个用户重复调用一个函数，且每次都小于设置的时间，那么只会调用一次。</p>
<p>防抖的应用场景：</p>
<ol>
<li>每次 resize/scroll 触发统计事件</li>
<li>文本输入的验证（连续输入文字后发送 ajax 请求验证，验证一次就好）</li>
</ol>
<p>节流的应用场景</p>
<ol>
<li>DOM 元素拖拽</li>
<li>射击游戏的 mousedown/clickdown 事件</li>
<li>计算鼠标移动的距离</li>
<li>canvas 模拟画布功能</li>
<li>搜索联想</li>
</ol>
<blockquote>
<ol>
<li>取数组的最大值（es5,es6）</li>
</ol>
</blockquote>
<p>首先看 Math.max 的 api，发现里面的值是 value1，value2 这种结构的，所以 es6 实现起来比较简单，直接使用解构的可以完成</p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div></pre></td><td class="code"><pre><div class="line"><span class="comment">// es6</span></div><div class="line"><span class="built_in">Math</span>.max(...[<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>]);</div><div class="line"></div><div class="line"><span class="comment">// es5</span></div><div class="line"><span class="built_in">Math</span>.max.apply(<span class="literal">null</span>, [<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>]);</div></pre></td></tr></table></figure>
<blockquote>
<ol>
<li><strong>es6 新的特性有哪些</strong></li>
</ol>
</blockquote>
<ol>
<li>新增了块级作用域（let，const）</li>
<li>新增了定义类的语法糖（class）</li>
<li>新增了模板字符串</li>
<li>新增了对象和数组的扩展运算符</li>
<li>新增了变量的解构取值</li>
<li>新增了一种基本数据类型（symbol）</li>
<li>新增了箭头函数，新增了 rest 参数，参数可以设置默认值</li>
<li>新增了 set 和 map 数据结构</li>
<li>数据新增了一些 api，isArray,form，实例新增了一些 api，entries,keys</li>
<li>新增了模块化（import/export）</li>
</ol>
<blockquote>
<ol>
<li><strong>setTimeout 倒计时为什么会出现误差</strong></li>
</ol>
</blockquote>
<p>setTimeout 只是将任务插入任务队列，必须等执行栈执行完，主线程才会去执行指定的回调函数。要是当前代码执行时间过长，可能会等很长时间。所以 setTimeout 函数第二个参数指的是最少时间，并非是确切时间。</p>
<blockquote>
<p><strong>26. 为什么 0.1 + 0.2 !== 0.3</strong></p>
</blockquote>
<p>是因为在进制转换和进阶运算的过程中出现精度损失。</p>
<blockquote>
<p><strong>27. promise 有几种状态，promise 有什么优缺点</strong></p>
</blockquote>
<p>promise 有三种状态，resolved，rejected，pending</p>
<h6 id="优点"><a href="#优点" class="headerlink" title="优点"></a>优点</h6><ol>
<li>可以将异步操作以同步操作的流程表达出来，避免层层嵌套</li>
<li>一旦状态发生变化，就不可改变</li>
</ol>
<h6 id="缺点"><a href="#缺点" class="headerlink" title="缺点"></a>缺点</h6><ol>
<li>无法取消 promise</li>
<li>pending 状态无法知道进展到哪一个阶段</li>
</ol>
<blockquote>
<p><strong>28. promise 构造函数是同步还是异步执行？then 中的方法呢？promise 如何实现 then 处理？</strong></p>
</blockquote>
<p>promise 的构造函数是同步执行，then 中的方法是异步执行。</p>
<blockquote>
<ol>
<li><strong>Promise 和 setTimeout 的区别</strong></li>
</ol>
</blockquote>
<p>promise 是微任务，setTimeout 是宏任务，在同一个事件循环中，promise 总是先于 setTimeout 执行</p>
<blockquote>
<p><strong>30. 如何实现 Promise.all</strong></p>
</blockquote>
<p>Promise.all 的功能：</p>
<ol>
<li>如果传入的参数是一个空的可迭代对象，那么此 promise 对象回调完成，只有此情况，是同步执行的，其它都是异步执行的。</li>
<li>如果传入的参数不包含任何 promise，则返回一个异步完成。promise 中所有的 promise 都完成时或参数中不包含 promise 时回调完成</li>
<li>如果参数中有一个 promise 失败，那么 Promise.all 返回的 promise 对象失败</li>
<li>在任何情况下，Promise.all 返回的 promise 的完成状态的结果都是一个数组</li>
</ol>
<blockquote>
<p><strong>31. 如何实现 Promise.finally</strong></p>
</blockquote>
<p>不管成功还是失败，都会走到 finally，并且 finally 之后，还可以继续 then。并且会将值原封不动的传递给后面的 then。</p>
<blockquote>
<p><strong>32. 什么是函数柯里化?</strong></p>
</blockquote>
<p>函数柯里化就是把接受多个参数的函数变换成接受一个单一参数（最初函数的第一个参数）的函数，并且返回接受余下的参数并且返回结果的新函数的技术。</p>
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<a class="article-title" href="/2017/09/29/AJAX技术/">AJAX技术</a>
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<h4 id="Ajax-技术"><a href="#Ajax-技术" class="headerlink" title="Ajax 技术"></a>Ajax 技术</h4><p>全称： AsynchronousJavascriptandXML<br>Ajax 核心是 XMLHttpRequest 对象，简称 XHR,用于使浏览器向服务端发送额外的数据而不卸载页面</p>
<h4 id="xmlHttpRequest-对象和请求"><a href="#xmlHttpRequest-对象和请求" class="headerlink" title="xmlHttpRequest 对象和请求"></a>xmlHttpRequest 对象和请求</h4><p>xhr 是一个 api,为客户端提供服务端和客户端通信的功能，并且不会刷新页面。它不仅能取回 xml 类型的数据，而且能取回所有类型的数据，除了 http 协议，还支持 file 和 ftp 协议。我们可以通过其构造函数来创建一个新的 xhr 对象。</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div></pre></td><td class="code"><pre><div class="line">var xhr = new XMLHttpRequest();</div></pre></td></tr></table></figure>
<p>xhr 的原型链：</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div></pre></td><td class="code"><pre><div class="line">Object -> EventTarget->XMLHttpRequestEventTarget->XMLHttpRequest</div></pre></td></tr></table></figure>
<p>xhr 对象拥有原型链上和本身的方法和属性:<br><img src="https://ws4.sinaimg.cn/large/006tNc79gy1fmpqkbmayaj311w0rm48z.jpg" alt="xhr对象的生命周期"><br>我们解释下它的几个主要方法，我们在创建了新的 xhr 对象之后，首先调用它的 open（）方法：</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div></pre></td><td class="code"><pre><div class="line">// 第一个参数科室为get/post等，表示该请求的类型</div><div class="line">// 第二个请求是请求的url，可以为相对路径或绝对路径</div><div class="line">// 第三个参数代表是否异步，为true时异步</div><div class="line">// 第四五个参数为可选的授权使用的参数，因为安全性不推荐明文使用</div><div class="line">xhr.open('get', 'example.php', true, username, password)；</div></pre></td></tr></table></figure>
<p>在这里受同源策略的影响，当第二个参数 url 跨域的时候会被浏览器报安全错误。<strong>同源策略指的是当前页面和目标 url 协议、域名和端口均相同。</strong>后面也会讲到，除 ie 之外的浏览器通过 XHR 对象实现跨域请求，只需将 url 设置为绝对 url 即可。</p>
<p>当初始化请求完成后，我们调用 send（）方法发送请求：</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div></pre></td><td class="code"><pre><div class="line">var data = new FormData();</div><div class="line">data.append('name', 'Nicholas');</div><div class="line">// 接受一个请求主体发送的数据，如果不需要，传入null</div><div class="line">xhr.send(data);</div></pre></td></tr></table></figure>
<p>当请求类型为 get/head 时，send()的参数会被忽略并置为 null，send()传递的参数会影响到我们请求的头部 content-type 的默认值,该字段代表返回的资源内容的类型，用于浏览器处理，如果没有设置或在一些场景下，浏览器会进行 MIME 嗅探来确定怎么处理返回的资源。</p>
<p>在 XHR2 级中定义了 FormData 数据，用于常见的类表单数据序列化：</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div><div class="line">20</div><div class="line">21</div></pre></td><td class="code"><pre><div class="line">// 直接传入表单id</div><div class="line">var data = new FormData(document.getElementById('user-form'))</div><div class="line"></div><div class="line">// 创建类表单数据</div><div class="line">var data = new FormData()</div><div class="line">data.append('name', 'Nico')</div><div class="line"></div><div class="line">// 'Formdata'可以直接被send()调用，会自动修改xhr的content-type头部</div><div class="line">xhr.send(data);</div><div class="line"></div><div class="line">// 请求头部的content-type: multipart/form-data; boundary=----WebKitFormBoundaryjn3q2KKRYrEH55Vz</div><div class="line">// 请求的上传数据 Request Payload:</div><div class="line">------WebKitFormBoundaryjn3q2KKRYrEH55Vz</div><div class="line"></div><div class="line">Content-Disposition: form-data; name="name"</div><div class="line"></div><div class="line"></div><div class="line">Nicholas</div><div class="line"></div><div class="line">------WebKitFormBoundaryjn3q2KKRYrEH55Vz</div><div class="line">--</div></pre></td></tr></table></figure>
<p>FormData 常用的方法有<br>append/delete/entries/foreach/get/getAll/has/keys/set/values,都是常用的跟数据类似的方法，不再解释。</p>
<h4 id="请求方法"><a href="#请求方法" class="headerlink" title="请求方法"></a>请求方法</h4><p>GET 是最常见的请求类型，可以将查询字符串参数添加到 URL 尾部，对 XHR 而言，该查询字符串必须经过正确编码，每个键值对必须使用 encodeURIComponent()进行编码，键值对之间由&分割：</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div></pre></td><td class="code"><pre><div class="line">function addURLParam(url, name, value) {</div><div class="line"> url+=url.indexOf(?) === -1 ? '?' : '&');</div><div class="line"> url += encodeURIComponent(name) + '=' + encodeURIComponent(value);</div><div class="line"> return url;</div><div class="line">}</div></pre></td></tr></table></figure>
<p>POST 请求使用频率仅次于 GET 请求，通常发送较多数据，且格式不限，数据传递给 send（）作为参数。<br>HTTP 一共规定了九种请求方法，每一个动词代表不同的语义，但是常用的只有上面的两种：</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div></pre></td><td class="code"><pre><div class="line">- OPTIONS：返回服务器针对特定资源所支持的HTTP请求方法。也可以利用向Web服务器发送'*'的请求来测试服务器的功能性。</div><div class="line"></div><div class="line">- HEAD：向服务器索要与GET请求相一致的响应，只不过响应体将不会被返回。这一方法可以在不必传输整个响应内容的情况下，就可以获取包含在响应消息头中的元信息。</div><div class="line"></div><div class="line">- GET：向特定的资源发出请求。</div><div class="line"></div><div class="line">- POST：向指定资源提交数据进行处理请求（例如提交表单或者上传文件）。数据被包含在请求体中。POST请求可能会导致新的资源的创建和/或已有资源的修改。</div><div class="line"></div><div class="line">- PUT：向指定资源位置上传其最新内容。</div><div class="line"></div><div class="line">- DELETE：请求服务器删除Request-URI所标识的资源。</div><div class="line"></div><div class="line">- TRACE：回显服务器收到的请求，主要用于测试或诊断。</div><div class="line"></div><div class="line">- CONNECT：HTTP/1.1协议中预留给能够将连接改为管道方式的代理服务器。</div><div class="line"></div><div class="line">- PATCH: 用于对资源进行部分修改</div></pre></td></tr></table></figure>
<h4 id="HTTP-头部信息"><a href="#HTTP-头部信息" class="headerlink" title="HTTP 头部信息"></a>HTTP 头部信息</h4><p>每个 HTTP 请求和响应都带有头部信息。我们可以通过 xhr.setRequestHeader()方法来设置自定义的头部信息或者修改浏览器默认的正常头部信息。常用的头部请求：</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div></pre></td><td class="code"><pre><div class="line">Accept: 浏览器能够处理的内容类型。// */*</div><div class="line"></div><div class="line">Accept-Charset:浏览器能够显示的字符集。// 未取到</div><div class="line"></div><div class="line">Accept-Encoding:浏览器能够处理的压缩编码。// gzip,deflate</div><div class="line"></div><div class="line">Accept-Language:浏览器当前设置的语言。// zh-CN,zh;q=0.8,en;q=0.6</div><div class="line"></div><div class="line">Connection:浏览器与服务器之间连接的类型。// keep-alive</div><div class="line"></div><div class="line">Cookie: 当前页面设置的任意Cookie。// JlogDataSource=jomodb</div><div class="line"></div><div class="line">Host: 发出请求的页面所在域。// gzhxy-cdn-oss-06.gzhxy.baidu.com:8090</div><div class="line"></div><div class="line">Referer: 发出请求的页面URI。// http://gzhxy-cdn-oss-06.gzhxy.baidu.com:8090/jomocha/index.php?r=tools/offline/index</div><div class="line"></div><div class="line">User-Agent:浏览器的用户代理字符串。// Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/61.0.3163.100 Safari/537.36</div></pre></td></tr></table></figure>
<p>我们一般不修改浏览器正常的头部信息，可能会影响到服务器响应。如果需要可以通过 xhr.setRequestHeader()进行修改：</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div></pre></td><td class="code"><pre><div class="line">// 传入头部键值对，键值对不区分大小写，如果多次设置，则追加</div><div class="line">// 此时请求头部的content-type: application/json, text/html</div><div class="line">xhr.setRequestHeader('content-type', 'application/json');</div><div class="line">xhr.setRequestHeader('content-type', 'application/json');</div></pre></td></tr></table></figure>
<p>设置头部信息需要在 open()之后，send()之前调用。响应的头部信息在后端处理。有一部分请求头部不允许设置，如 Accept-Encoding,Cookie 等。</p>
<p>在请求返回后，我们可以获取到响应头部：</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div></pre></td><td class="code"><pre><div class="line">// 获取指定项的响应头</div><div class="line">xhr.getResponseHeader('content-type');</div><div class="line">// 获取所有的响应头部信息</div><div class="line">xhr.getAllResponseHeaders();</div></pre></td></tr></table></figure>
<p>这里简单说下 content-type 值，指的是请求和响应的 HTTP 内容类型，影响到服务器和浏览器对数据的处理方式，默认为 text/html,常用的如：</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div></pre></td><td class="code"><pre><div class="line">// 包含资源类型，字符编码，边界字符串三个参数，可选填</div><div class="line">text/html;charset=utf-8 // html标签文本</div><div class="line">text/plain // 纯文本</div><div class="line">text/css // css文件</div><div class="line">text/javascript // js文件</div><div class="line">// 普通的表单数据，可以通过表单标签的enctype属性指定</div><div class="line">application/x-www-form-urlencode</div><div class="line">// 发送文件的POST包，包过大需要分片时使用'boundary'属性分割数据作边界</div><div class="line">multipart/form-data; boundary=something</div><div class="line">application/json // json数据格式</div><div class="line">application/xml // xml类型的标记语言</div></pre></td></tr></table></figure>
<h4 id="xhr-对象的响应"><a href="#xhr-对象的响应" class="headerlink" title="xhr 对象的响应"></a>xhr 对象的响应</h4><p>我们现在对请求的发起很了解了，接着看下如何拿到响应数据。如果我们给 open()传递的第三个参数是 true，则代表为同步请求，那么 js 会被阻塞知道拿到响应，而如果为 false 则是异步请求，我们只需要绑定 xhr.onreadystatechange()事件监听响应即可。最上面的图已经说明了 readystate 的值含义，所以我们可以：</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div></pre></td><td class="code"><pre><div class="line">// xhr v1的写法，检测readystate的值，为4则说明数据准备完毕，需要在open()前定义</div><div class="line">xhr.onreadystatechange = function() {</div><div class="line"> if (xhr.readyState === 4) {</div><div class="line"> if (xhr.status === 200 || xhr.status === 304) {</div><div class="line"> console.log(xhr.responseText);</div><div class="line"> } else {</div><div class="line"> console.log(xhr.statusText);</div><div class="line"> }</div><div class="line"> }</div><div class="line">}</div><div class="line"></div><div class="line">// xhr v2的写法，onload()事件说明数据准备完毕</div><div class="line">xhr.onload = function() {</div><div class="line"> if (xhr.status === 200 || xhr.status === 304) {</div><div class="line"> console.log(xhr.responseText);</div><div class="line"> } else {</div><div class="line"> console.log(xhr.statusText);</div><div class="line"> }</div><div class="line">}</div></pre></td></tr></table></figure>
<p>xhr 对象的响应数据中包含几个属性：</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div></pre></td><td class="code"><pre><div class="line">response // 响应的数据</div><div class="line">responseURL // 发起响应的URL</div><div class="line">responseType // 响应的类型，用于浏览器强行重置响应数据的类型</div><div class="line">responseText // 如果为普通文本，则在这显示</div><div class="line">responseXML // 如果为xml类型文本，在这里显示</div></pre></td></tr></table></figure>
<p>数据会出现在 responseText/responseXML 中的哪一个，取决于服务器返回的 MIME 类型，当然我们也有一些方式在浏览器端设置如何处理这些数据：</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div></pre></td><td class="code"><pre><div class="line">// xhr v1 的写法，设置响应资源的处理类型</div><div class="line">xhr.overrideMimeType('text/xml');</div><div class="line"></div><div class="line">// xhr v2 的写法，可用值为arraybuffer/blob/document/json/text</div><div class="line">xhr.responseType = 'document';</div></pre></td></tr></table></figure>
<p>响应数据相关的属性默认为 null/‘’,只有当请求完成并被正确解析的时候才会有值，取决于 responseType 的值，来确定 response/responseText/responseXML 谁最终具有值。</p>
<h4 id="跨域-cors"><a href="#跨域-cors" class="headerlink" title="跨域 cors"></a>跨域 cors</h4><p>提到 xhr 对象，我们就会讲到跨域问题，它是为了预防某些恶意行为的安全策略，但有时候我们需要跨域来实现某些功能。需要注意的是跨域并不仅仅是前端单方面的事情，它需要后端代码进行配合，我们只是通过一些方法跳过来浏览器的阻拦。</p>
<p>对那些可能对服务器数据产生副作用的 HTTP 请求方法（特别是 GET 以外的 HTTP 请求，<a href="https://developer.mozilla.org/zh-CN/docs/Web/HTTP/Basics_of_HTTP/MIME_types" target="_blank" rel="external">或者搭配某些 MIME 类型的 POST 请求</a>），浏览器必须首先使用 OPTIONS 方法发起一个预检请求（preflight request）,从而获知服务端是否允许该跨域请求。服务器确认允许之后，才发起实际的 HTTP 请求。</p>
<p>CORS(Cross-OriginResourceSharing,跨域资源共享)的思想是浏览器和服务端通过头部信息来进行沟通确认是否给予响应。如：</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div></pre></td><td class="code"><pre><div class="line">Origin: http://www.baidu.com // 浏览器的头部信息</div><div class="line">// 如果服务端认可这个域名的跨域请求，如下设置就可跨域访问资源</div><div class="line">Access-Control_Allow-Origin: http://www.baidu.com</div></pre></td></tr></table></figure>
<p>如上就可以实现最简单的跨域访问，但是此时不能携带任何的 cookie，如果我们需要传递 cookie 进行身份认证，需要设置：</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div></pre></td><td class="code"><pre><div class="line">xhr.withCredentials = true； // 浏览器端</div><div class="line">Access-Control—Allow-Credentials：true // 服务端</div></pre></td></tr></table></figure>
<p>这样我们就可以传递认证信息了，但如果允许认证，Access-Control-Allow-Origin 不能设置为*，而一定是具体的域名信息。</p>
<p>现在的浏览器都对 CORS 有了实现，如 IE 使用 XDomainRequest 对象，其它浏览器使用 XMLHttpRequest 对象。所以在此之前有很多奇淫技巧，如通过 jsonp/图像 Ping 方法都不再详述，而且其都需要服务端配合并且有很多局限性。</p>
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