function GetQueryString(name) {
varreg=newRegExp("(^|&)" + name + "=([^&]*)(&|$)", "i");
varr=window.location.search.substr(1).match(reg); //获取url中"?"符后的字符串并正则匹配
varcontext="";
if (r != null)
context=r[2];
reg=null;
r=null;
returncontext== null ||context== "" ||context== "undefined" ? "" : context;
