示例程序
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<script type="text/javascript" src="Vue-v2.5.22.js"></script>
<title>Title</title>
<style>
.fade-enter-active,
.fade-leave-active {
transition: opacity .5s
}
.fade-enter,
.fade-leave-to
{
opacity: 0
}
</style>
</head>
<body>
<div id="app">
<transition name="fade">
<div v-if="show">Vue</div>
</transition>
<!--vm.show=true-->
</div>
<script>
var vm = new Vue({
el: '#app',
data: {
show: false
}
});
</script>
</body>
</html>