code：
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Vue中组件的过渡</title>
<script type="text/javascript" src="js/vue.js" ></script>
<style>
.fade-enter,.fade-leave-to{
opacity: 0;
}
.fade-enter-active,.fade-leave-active{
transition: opacity 1s;
}
</style>
</head>
<body>
<div id="root">
<transition name="fade" mode="out-in">
<component :is="type"></component>
</transition>
<button @click="handleClick">切换</button>
</div>
<script>
Vue.component('child',{
template:'<div>child</div>'
})
Vue.component('child-one',{
template:'<div>child-one</div>'
})
new Vue({
el:"#root",
data:{
type:"child"
},
methods:{
handleClick(){
this.type=this.type==='child'?'child-one':'child'
}
}
})
</script>
</body>
</html>