<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<script src="http://apps.bdimg.com/libs/jquery/2.1.4/jquery.min.js"></script>
</head>
<style>
*{margin:0;padding:0}
.view{width: 200px;height:0;margin:0 auto;background: #000;display:none}
.hit{display: block;margin: 0 auto}
</style>
<body>
<div class="view">asddddddddddd</div>
<button class="hit">点击</button>
</body>
<script>
$(".hit").on("click",function(){
$(".view").animate({height:"200px"},2000)
.css("display","block")
})
</script>
</html>
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