<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
</head>
<body>
<div id="app">
性别:<input type="radio" v-model="sex" value=‘male‘ id="male"><label for="male">男</label>
<input type="radio" v-model="sex" value="female" id="female"><label for="female">女</label>
<br/>
<span>{{sex}}</span>
</div>
<script>
var v=new Vue({
el:"#app",
data:{
sex:‘male‘
}
})
</script>
</body>
</html>
当 sex值跟value一致时，就会选中
