<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-type" content="text/html; charset=utf-8" />
<title></title>
<style>
.left div,
.right div {
100px;
height: 50px;
padding: 5px;
margin: 5px;
float: left;
border: 1px solid #ccc;
}
.left div {
background: #bbffaa;
}
.right div {
background: yellow;
}
</style>
<script src="https://lib.sinaapp.com/js/jquery/1.9.1/jquery-
1.9.1.min.js"></script>
</head>
<body>
<h2>slideDown</h2>
<div class="left">
<h4>测试一</h4>
<div class="a" id="a1">hide-show</div>
<select id="cs" >
<option value="1">向下</option>
<option value="2">向右</option>
<option value="3">淡出</option>
<option value="4">淡入</option>
</select>
<button class="qd">确定</button>
</div>
<div class="right">
<h4>测试二</h4>
<div class="b" id="a2">hide-show</div>
<button>点击slideDown执行回调</button>
</div>
<script type="text/javascript">
$(".qd").click(function(){
var v =$("#cs").val()
if(v == "1"){$(".a").animate({height:300},3000)}
else if(v == "2"){$(".a").animate({500},3000)}
else if(v == "3"){$(".a").animate({opacity:0.2},3000)}
else if(v == "4"){$(".a").animate({opacity:1},3000)}
})
</script>
</body>
</html>