vue.js中v-on:textInput无法执行事件问题的解决过程

<div id="wrap">
  <input type="text" v-on:textInput="fn">
</div>
<script type="text/javascript" src="vue.js"></script>
<script type="text/javascript">
  new Vue({
   el:'#wrap',
   methods:{
    fn:function(){
     console.log('textInput');
    }
   }
  });
</script>

/
  Get outerHTML of elements, taking care
  of SVG elements in IE as well.
 /
function getOuterHTML (el) {
 if (el.outerHTML) {
 return el.outerHTML
 } else {
 var container = document.createElement('div');
 container.appendChild(el.cloneNode(true));
 return container.innerHTML
 }
}