Create 异步加载JS文件并执行回调函数.js

Rain120 · Apr 3, 2018 · 7f7abe5 · 7f7abe5
1 parent 9eefb28
commit 7f7abe5
Showing 1 changed file with 21 additions and 0 deletions.
diff --git a/异步加载JS文件并执行回调函数.js b/异步加载JS文件并执行回调函数.js
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+// 异步加载JS文件并执行回调函数
+
+function loadJS(url, callback) {
+  var script = document.createElement('script');
+  var head = getElementsByTagName('head')[0];
+  var loaded;
+  script.src = url;
+  if (typeof callback === 'function') {
+    script.onload = script.onreadystatechange = function () {
+      if (!loaded && (!script.readyState || /loaded|complete/.test(script.readyState))) {
+        script.onload = script.onreadystatechange = null;
+        loaded = true
+        callback();
+      }
+    }
+  }
+  head.appendChild(script);
+}
+loadJS('test.js', function() {
+  console.log('callback');
+});