原理 先建立一个div全屏，然后网页加载完成后隐藏div。
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>呵呵</title>
<meta name="viewport" content="width=device-width,initial-scale=1.0,maximum-scale=1.0,minimum-scale=1.0,user-scalable=no">
<style type="text/css">
#loading{ position: fixed;background-color: #fff; bottom: 0px;left: 0px;right: 0px;top: 0px; z-index: 999999;}
#status{ position: absolute; left:50%; top:50%; width:250px; height:250px; margin: -125px 0 0 -125px; }
.center-text { margin:auto; background-image: url("loading.jpg"); background-position: center top; background-repeat: no-repeat;height: 182px; text-align: center;width: 220px;}
.center-text span { color: #999999; font-size: 14px; position: relative; top: 170px;}
</style>
<script src="http://apps.bdimg.com/libs/jquery/2.1.4/jquery.min.js"></script>
<script >
$(document).ready(function(){
$("#status").fadeOut();
$("#loading").delay(350).fadeOut("slow");
})
</script>
</head>
<body>
<div id="loading"><div id="status"><p class="center-text"><span>拼命加载中···</span></p></div></div>
<table width="100%" border="1">
<tr>
<td>1</td>
<td>2</td>
</tr>
<tr>
<td>2</td>
<td>1</td>
</tr>
<tr>
<td>3</td>
<td>1</td>
</tr>
<tr>
<td>2</td>
<td>3</td>
</tr>
<tr>
<td>2</td>
<td>3</td>
</tr>
<tr>
<td>8</td>
<td>9</td>
</tr>
<tr>
<td>2</td>
<td>0</td>
</tr>
<tr>
<td>1</td>
<td>9</td>
</tr>
</table>
</body>
</html>