function test() { var retVal =new Array(); var elements = document.getElementsByTagName("A"); //alert('A has '+elements.lenght+'elements'); for (var i=0;i<elements.length;i++) { if (elements[i].className=='postTitle2') retVal.push(elements[i]); } //alert('retVal.length='+retVal.length); if (retVal.length==0) return; var a = Math.random()*retVal.length; var b = Math.round(a); if (b==0) b=1; if (b>retVal.length-1) b=retVal.length-1; var sHref = retVal[b];//这个是随机获取的超链接 var sInner = retVal[b].innerHTML;//这个是文字 var sResult = '<a href="'+sHref+'" target="_blank"><font color=red>'+sInner+'</font></a>'; //alert(sResult); return sResult; }