<!DOCTYPE html>
<html lang="en">
<head>
<title></title>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<script src="../js_lib/vue-2.3.0.js"></script>
<script>
Vue.component('child', {
template: `<div>
<h1 v-if="level === 1">
1
</h1>
<h1 v-if="level === 2">
2
</h1>
<h1 v-if="level === 3">
3
</h1>
</div>`,
props: {
level: {
type: Number
}
}
});
</script>
</head>
<body>
<div id="app">
<span v-for="i in 3">
{{i}}:
<input type="radio" v-model="level" :value="i">
</span>
<child ref="child" :level="level"></child>
</div>
<script>
new Vue({
el: '#app',
data: {
level: 1
}
});
</script>
</body>
</html>
