网速测函数代码

<SCRIPT LANGUAGE="JavaScript">
window.status = "下载数据中..."
var st = new Date()
</SCRIPT>
<img src="img.jpg?id=<%=Imgrandom%>" width=0 height=0 onerror = showerr() onload="showspeed();">
<SCRIPT LANGUAGE="JavaScript">
function showspeed()
{
var fs = 137.57 //img.jpg文件大小(K)
var l = 2   //小数点的位数
var et = new Date()
alltime = fs*1000/(et - st)
Lnum = Math.pow(10,l)
calcspeed = Math.round(alltime*Lnum)/Lnum
showtxt.innerHTML = ("服务器时间为：<%=now%>，您在本站的下载速度为："+calcspeed+" (K/秒)")
window.status = "您在本站的下载速度为："+calcspeed+" (K/秒)"
}
function showerr()
{
showtxt.innerHTML = ("数据下载错误,请刷新重试")
window.status = "数据下载错误,请刷新重试"
}
</SCRIPT>