可以使用vue的transition包裹结合自定义css样式实现：
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width,initial-scale=1.0,maximum=1.0,minimum=1.0,user-scalable=0" />
<script type="text/javascript" src="//repo.bfw.wiki/bfwrepo/js/vue@2.6.1.js"></script>
<style>
.fade-enter-active,
.fade-leave-active {
transition: opacity 0.5s;
}
.fade-enter,
.fade-leave-to {
opacity: 0;
}
</style>
</head>
<body>
<div id="app">
<button @click="toggle">Toggle</button>
<transition name="fade">
<p v-if="show">Hello, world!</p>
</transition>
<transition name="fade">
<p v-if="!show">Goodbye, world!</p>
</transition>
</div>
<script>
new Vue({
el: '#app',
data: {
show: true
},
methods: {
toggle() {
this.show = !this.show;
}
}
});
</script>
</body>
</html>
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