//当前页面URL中参数分析函数，正则校验function getQueryString(name) {    var reg = new RegExp("(^|&)" + name + "=([^&]*)(&|$)", "i");    var r = window.location.search.substr(1).match(reg);    if (r != null) return unescape(r[2]); return null;    }  function zan(){//取得想要的参数值，getQueryString中的参数为String型，传入参数名为URL中参数名，即可获得	var docchannel = getQueryString("docchannel");    var docid = getQueryString("docid"); var xmlhttp;if (window.XMLHttpRequest)  {//  for IE7+, Firefox, Chrome, Opera, Safari  xmlhttp=new XMLHttpRequest();  }else  {//  for IE6, IE5  xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");  }xmlhttp.onreadystatechange=function()  {  if (xmlhttp.readyState==4 && xmlhttp.status==200)    {    document.getElementById("zanspan").innerHTML=xmlhttp.responseText;    }  }xmlhttp.open("GET","./manager/zan+1.jsp?t="+Math.random()+"&docid="+docid+"&docchannel="+docchannel+"",true);xmlhttp.send();}