JS数据载入中Loading

&lt;script&gt;
  function loadBar(fl)
  {
  	var x, y;
  	if (self.innerHeight)
  	{
  		x = self.innerWidth;
  		y = self.innerHeight;
  	}
  	else if (document.documentElement &amp;&amp; document.documentElement.clientHeight)
  	{
  		x = document.documentElement.clientWidth;
  		y = document.documentElement.clientHeight;
  	}
  	else if (document.body)
  	{
  		x = document.body.clientWidth;
  		y = document.body.clientHeight;
  	}
  	var el = document.getElementById('loader');
  	if (null != el)
  	{
  		var top = (y / 2) - 50;
  		var left = (x / 2) - 150;
  		if (left &lt;= 0) left = 10;
  		el.style.visibility = (fl == 1) ? 'visible' : 'hidden';
  		el.style.display = (fl == 1) ? 'block' : 'none';
  		el.style.left = left + "px"
  		el.style.top = top + "px";
  		el.style.zIndex = 2;
  	}
  }
&lt;/script&gt;
&lt;body onload="loadBar(0)"&gt;
&lt;div id="loader"&gt;
	&lt;table style="FILTER: Alpha(opacity=75);" class="loader" summary="Loader Layout" border="0" cellpadding="5" cellspacing="1" bgcolor="#bbbbb"&gt;
	&lt;tr&gt;
		&lt;td bgcolor="#FFFFFF" align="left"&gt;
			&lt;p&gt;
				&lt;img src="clocks.gif" height="32" width="32" align="left" style="margin:3px" alt="请等待"/&gt;&lt;strong&gt;数据载入中...&lt;/strong&gt;&lt;br/&gt;
				&lt;span style="font-size:8pt;"&gt;Please wait until this screen is completely loaded.&lt;/span&gt;
			&lt;/p&gt;
		&lt;/td&gt;
	&lt;/tr&gt;
	&lt;/table&gt;
&lt;/div&gt;
&lt;script type="text/javascript" language="javascript"&gt;loadBar(1)&lt;/script&gt;
&lt;/body&gt;

function loadBar(fl)

{

var x, y;

if (self.innerHeight)

{

x = self.innerWidth;

y = self.innerHeight;

}

else if (document.documentElement && document.documentElement.clientHeight)

{

x = document.documentElement.clientWidth;

y = document.documentElement.clientHeight;

}

else if (document.body)

{

x = document.body.clientWidth;

y = document.body.clientHeight;

}

var el = document.getElementById('loader');

if (null != el)

{

var top = (y / 2) - 50;

var left = (x / 2) - 150;

if (left <= 0) left = 10;

el.style.visibility = (fl == 1) ? 'visible' : 'hidden';

el.style.display = (fl == 1) ? 'block' : 'none';

el.style.left = left + "px"

el.style.top = top + "px";

el.style.zIndex = 2;

}

</script>

<tr>

<p>

<img src="clocks.gif" height="32" width="32" align="left" style="margin:3px" alt="请等待"/><strong>数据载入中...</strong><br/>

<span style="font-size:8pt;">Please wait until this screen is completely loaded.</span>

</p>

</td>

</tr>

</table>

</div>

</body>

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