<style>
.change{background-color:red}
.normal{background-color:white}
</style>
<body>
<div οnmοuseοver="this.className='change'" οnmοuseοut="this.className='normal'">放上来就变色</div>
</body>
<style>
.change{background-color:red}
.normal{background-color:white}
</style>
<body>
<div οnmοuseοver="this.className='change'" οnmοuseοut="this.className='normal'">放上来就变色</div>
</body>
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