onerror实现js测试网络速度（转）

<script>tim=1//每0.1s tim++setInterval("tim++",100)b=1var autourl=new Array()autourl[1]="www.cnblogs.com"autourl[2]="www.cnblogs.com/zhangjidong"autourl[3]="www.cctv.com"autourl[4]="www.sina.com.cn"function butt(){document.write("<form name=autof>")for(var i=1;i<autourl.length;i++)document.write("<input type=text name=txt"+i+" size=10 value=测试中……> =》<input type=text name=url"+i+" size=40> =》<input type=button value=GO onclick=window.open(this.form.url"+i+".value)><br>")document.write("<input type=submit value=刷新></form>")}butt()function auto(url){document.forms[0]["url"+b].value=urlif(tim>200){document.forms[0]["txt"+b].value="链接超时"}else{document.forms[0]["txt"+b].value="时间"+tim/10+"秒"}b++}function run(){for(var i=1;i<autourl.length;i++)document.write("<img src=http://"+autourl[i]+"/"+Math.random()+" width=1 height=1 onerror=auto('http://"+autourl[i]+"')>")}run()</script>