//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();

}