js获取url参数

function getUrlPara(paraName) {
               var sUrl = location.href;
               var sReg = "(?:\\?|&){1}" + paraName + "=([^&]*)"
               var re = new RegExp(sReg, "gi");
               re.exec(sUrl);
               return RegExp.$1;
           }
           var id = getUrlPara("id");