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@@ -0,0 +1,37 @@
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+<!DOCTYPE html>
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+<html lang="en">
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+<head>
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+ <meta charset="UTF-8">
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+ <meta name="viewport" content="width=device-width, initial-scale=1.0">
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+ <title>Document</title>
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+ <script src="./js/vue.js"></script>
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+</head>
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+<body>
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+ <div id="app">
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+ <h1>{{num1}}+{{num2}}={{sum}}</h1>
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+ <button @click="changeFun">change</button>
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+ </div>
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+ <script>
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+ var app = new Vue({
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+ el: '#app',
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+ data:{
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+ num1:1,
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+ num2:2,
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+ sum:0
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+ },
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+ methods:{
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+ changeFun:function(){
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+ this.num2 = 100
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+ }
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+ },
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+ watch:{
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+ num2:function(val,oldVal){
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+ // watch 监听num2的变化 接受两个参数 val 代表新值 oldVal 代表旧值
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+ console.log(val,oldVal)
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+ this.sum = this.num1 + val
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+ }
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+ }
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+ })
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+ </script>
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+</body>
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+</html>
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