动态组件与V-once指令
使用v-once性能会更好。
使用的时候就在Vue实例里加入template模板为内容即可。
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<script src='./vue.js'></script>
</head>
<body>
<!-- 使用v-once那么性能会更好，下次加载只会加载一次 -->
<div id="root" v-once>
<!-- <component :is="type"></component> -->
<!-- <child-one v-if="type === 'child-one'"></child-one>
<child-two v-if="type === 'child-two'"></child-two>
<button @click="handleBtnClick">change</button>; -->
</div>
<script>
Vue.component('child-one', {
template: '<div>child-one</div>'
})
Vue.component('child-two', {
template: '<div>child-two</div>'
})
var vm = new Vue({
el: '#root',
data: {
type: 'child-one'
},
template:`
<div>
<child-one v-if="type === 'child-one'" />
<child-two v-if="type === 'child-two'" />
<button @click="handleBtnClick">change</button>
</div>
`,
methods: {
handleBtnClick: function() {
this.type = (this.type === 'child-one' ? 'child-two': 'child-one');
}
}
})
</script>
</body>
</html>