CSS里也能可以写脚本

<style type="text/css">
.showCSS{
event:expression(
onmouseover = function()
{
this.style.backgroundColor='#f0f0f0'
},
onmouseout = function()
{
this.style.backgroundColor='#ffffff'
}
)
}
</style>
<div class="showCSS">试试移动你的鼠标看看</div>