<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<script src="js/jquery-1.11.2.min.js"></script>
<style type="text/css">
.d{
height: 150px;
width: 150px;
margin: 5px;
background-color: red;
float: left;
}
</style>
</head>
<body>
<div class="d"></div>
<div class="d"></div>
<div class="d"></div>
<div class="d"></div>
<div class="d"></div>
<div class="d"></div>
<div class="d"></div>
<div class="d"></div>
<div class="d"></div>
<div class="d"></div>
<div class="d"></div>
<div class="d"></div>
<div class="d"></div>
<div class="d"></div>
</body>
<script>
$(".d").mouseover(function(){
//让所有的div变成红色
$(".d").css("background","red")
//让选中的变成绿色
$(this).css("background","green")
})
$(".d").mouseleave(function(){
$(".d").css("background-color","red")
})
</script>
</html>
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