事件处理等待

下面为效果显示

正在处理中
请稍等...

脚本说明:
把如下代码加入<body>区域中
		<script language="javascript">

function do_totals1()

{

document.all.pleasewaitScreen.style.pixelTop = (document.body.scrollTop + 50);

document.all.pleasewaitScreen.style.visibility="visible";

window.setTimeout('do_totals2()',1);

}

function do_totals2()

{

lengthy_calculation();

document.all.pleasewaitScreen.style.visibility="hidden";

}

function lengthy_calculation()

{

var x,y

for(x=0;x<1000000;x++)

{

y += (x * y) / (y - x);

}

}
		
		</script>
		<DIV ID="pleasewaitScreen" STYLE="position:absolute;z-index:5;top:30%;left:42%;visibility:hidden">
			<TABLE BGCOLOR="#000000" BORDER="1" BORDERCOLOR="#000000" CELLPADDING="0" CELLSPACING="0" HEIGHT="100" WIDTH="150" ID="Table1">
				<TR>
					<TD WIDTH="100%" HEIGHT="100%" BGCOLOR="silver" ALIGN="CENTER" VALIGN="MIDDLE">
						<FONT FACE="Arial" SIZE="4" COLOR="blue"><B>正在处理中<br>
								请稍等...</B></FONT>
					</TD>
				</TR>
			</TABLE>
		</DIV>
		<p align="center">
			<input type="button" name="btn_calc" value="处理等待" onclick="do_totals1()">
		</p>