以代码为例：
<!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>component-4 标签</title>
<script src="../assets/js/vue.js"></script>
</head>
<body>
<h1>component-4 标签</h1>
<hr>
<div id="app">
<component :is="who"></component>
<button @click="changeComponent">changeComponent</button>
</div>
<script>
var componentA = {
template: `<div style="color:red;">componentA</div>`
}
var componentB = {
template: `<div style="color:yellow;">componentB</div>`
}
var componentC = {
template: `<div style="color:green;">componentC</div>`
}
var app = new Vue({
el: '#app',
data: {
who: 'componentC'
},
components: {
'componentA': componentA,
'componentB': componentB,
'componentC': componentC
},
methods: {
changeComponent() {
if (this.who == 'componentA') {
this.who = 'componentB'
} else if (this.who == 'componentB') {
this.who = 'componentC'
} else {
this.who = 'componentA'
}
}
}
})
</script>
</body>
</html>
