<!DOCTYPE html><html> <head> <meta charset="utf-8" /> <title></title> <script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script> </head> <body> <div id="app"> {{message}} <input type="button" v-on:click="changeMsg" value="点击改变" /> </div> </body> <script type="text/javascript"> var vm = new Vue({ el:"#app", data:{ message:"hello vue!" }, methods:{ changeMsg(){ this.message = "你好啊 ！！！"; } } }) </script></html>请问这是哪里错了？为什么点击按钮，messge没有改变呢？
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慕的地8582982
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