bug fix for id

Author: njleonzhang

dist/docsify-demo-box-plugin.js

@@ -8,7 +8,7 @@
     "dev": "node build/dev-server.js",
     "start": "node build/dev-server.js",
     "build": "node build/build.js",
-    "plugin": "node build/build.js plugin"
+    "plugin": "node build/build.js plugin; cp dist/docsify-demo-box-plugin.js docs/"
   },
   "dependencies": {
     "vue": "^2.3.3"

dist/docsify-demo-box-plugin.min.js

@@ -49,7 +49,9 @@ export let generateComponent = function(code, lang, jsResources, cssResources, b
         :css-resources="cssResources"
         :boot-code="bootCode"
         :no-boot-code="noBootCode">
-        <div class="source" slot="source"><my-code/></div>
+        <div class="source" slot="source">
+          <my-code></my-code>
+        </div>
       </demo-block/>
     `,
 

dist/docsify-demo-box.js

@@ -5,6 +5,7 @@ install(Vue)
 
 export let create = function(jsResources, cssResources, bootCode) {
   return function(hook, vm) {
+    let id = 0
     window.$docsify.markdown = {
       renderer: {
         code: function(code, lang) {