fix sample

Author: jogibear9988

sample/index.html

@@ -48,7 +48,7 @@ <h1>DCE Demo</h1>
             <h1>Hello World</h1>
             <div>[[this.ctx]]</div>
             <template repeat:myitem="[[this.list]]">
-                <button @click="{{this.ctx = myitem}}"
+                <button @click="[[this.ctx = myitem]]"
                     $aaaonclick="[['this.getRootNode().host.ctx = \'' + myitem + '\'']]">[[myitem]] - [[index]]</button>
             </template>
         </template>