<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<title>Title</title>
<script src="js/vue-2.4.0.js"></script>
</head>
<body>
<div id="app">
<!--需求：点击按钮，让h3显示，再点击，让h3隐藏-->
<input type="button" value="toggle" @click="flag=!flag">
<h3 v-if="flag">这是一个h3</h3>
</div>
<script>
const vm=new Vue({
el:'#app',
data:{
flag:false
},
methods:{}
})
</script>
</body>
</html>