v-model实现双向数据绑定

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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
</head>
<body>
<div id="vue">
<h4>{{msg}}</h4>
<label>
<input type="text" v-model="msg">
</label>
</div>
<script>
const vm = new Vue({
el: "#vue",
data: {
msg: "test"
},
methods: {}
});
</script>
</body>
</html>

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