详细代码：
<template> <div> <h1>{{ msg }}</h1> <div> <div @mouseenter="flag=true" @mouseleave="flag=false"> <div :class="flag?'passing':''"></div> </div> </div> </div> </template> <script> export default { name: 'HelloWorld', data () { return { msg: 'Welcome to Your Vue.js App', flag:false } } } </script> <!-- Add "scoped" attribute to limit CSS to this component only --> <style scoped> .box{ width: 100%; height: 100%; } .boxchilde{ display: inline-block; margin: 20px; width: 200px; height: 400px; background-color: #ccc; border-radius: 5px; -webkit-transition: all 0.6s ease-in; -moz-transition: all 0.6s ease-in; -ms-transition: all 0.6s ease-in; -o-transition: all 0.6s ease-in; transition: all 0.6s ease-in; overflow: hidden; } .boxchilde:hover{ cursor: pointer; -webkit-transform: translate(0,-10px); -moz-transform: translate(0,-10px); -ms-transform: translate(0,-10px); -o-transform: translate(0,-10px); transform: translate(0,-10px); } .passing { width: 100%; height: 10px; border-top-left-radius: 5px; border-top-right-radius: 5px; background-color: red; animation: passing_4500 0.8s ease-in-out 0s 1 alternate forwards; transform-origin: 50% 50%; } @keyframes passing_4500 { 0% { transform:translateX(-100%); opacity:0 } 33.33333% { transform:translateX(-100%); opacity:0 } 66.66667% { transform:translateX(0%); opacity:1 } 100% { transform:translateX(0%); opacity:1 } } </style>
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