当一个网页页面太大的话打开时候就有一个空白，通过下面代码可以让等待的时候显示网页正在加载中的字样，代码如下：
<script language="JavaScript" type="text/javascript">
var t_id = setInterval(animate,20);
var pos=0;
var dir=2;
var len=0;
function animate()
{
var elem = document.getElementById('progress');
if(elem != null) {
if (pos==0) len += dir;
if (len>32 || pos>79) pos += dir;
if (pos>79) len -= dir;
if (pos>79 && len==0) pos=0;
elem.style.left = pos;
elem.style.width = len;
}
}
function remove_loading() {
this.clearInterval(t_id);
var targelem = document.getElementById('loader_container');
targelem.style.display='none';
targelem.style.visibility='hidden';
}
</script>
<style>
#loader_container {
text-align:center;
position:absolute;
top:40%;
width:100%;
left: 0;
}
#loader {
font-family:Tahoma, Helvetica, sans;
font-size:11.5px;
color:#000000;
background-color:#FFFFFF;
padding:10px 0 16px 0;
margin:0 auto;
display:block;
width:130px;
border:1px solid #5a667b;
text-align:left;
z-index:2;
}
#progress {
height:5px;
font-size:1px;
width:1px;
position:relative;
top:1px;
left:0px;
background-color:#8894a8;
}
#loader_bg {
background-color:#e4e7eb;
position:relative;
top:8px;
left:8px;
height:7px;
width:113px;
font-size:1px;
}
</style>
在body中修改如下：
<body onLoad="remove_loading();">
<div id="loader_container">
<div id="loader">
<div align="center">数据处理中，处理速度取决于数据量请稍等片刻...</div>
<div id="loader_bg"><div id="progress"> </div></div>
</div>
</div>
</body>
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