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<style type="text/css">
.aa{ width:90px; height:60px;text-align:center; vertical-align:middle; line-height:60px; margin-right:10px; font-size:19px; float:left;
background-color:#06F}
</style>
<body>
<div style=" width:990px; height:60px; background-color:#F0F;">
<div class="aa" style="border-bottom:2px solid #F00;">点击1</div>
<div class="aa">点击2</div>
<div class="aa">点击3</div>
<div class="aa">点击4</div>
<div class="aa">点击5</div>
</div>
</body>
<script type="text/javascript">
$(document).ready(function(e)
{
$(".aa").click(function()
{
$(".aa").css("color","#000");
$(".aa").css("font-weight","400");
$(".aa").css("border-bottom-style","solid");
$(".aa").css("border-bottom","1px");
$(this).css("color","red");
$(this).css("font-weight","bold");
$(this).css("border-bottom","2px");
$(this).css("border-bottom-style","solid");
$(this).css("border-bottom-color","red");
})
});
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原文地址：http://www.cnblogs.com/cuizhenyu/p/5941460.html
