本文参照：

jQuery.extend({/**    * Returns get parameters.    *    * If the desired param does not exist, null will be returned    *    * @example value = $.getURLParam("paramName");    */    getURLParam: function(strParamName)    {        var strReturn = "";        var strHref = window.location.href.toUpperCase();        var bFound = false;        var cmpstring = strParamName.toUpperCase() + "=";        var cmplen = cmpstring.length;        if (strHref.indexOf("?") > -1)        {            var strQueryString = strHref.substr(strHref.indexOf("?") + 1);0            var aQueryString = strQueryString.split("&");            for (var iParam = 0; iParam < aQueryString.length; iParam++)            {                if (aQueryString[iParam].substr(0, cmplen) == cmpstring)                {                    var aParam = aQueryString[iParam].split("=");                    strReturn = aParam[1];                    bFound = true;                    break;                }            }        }        if (bFound == false) return null;        //  www.permadi.com/tutorial/urlEncoding/        //
     
       %20  or +        // return escape(sStr).replace(/\+/g, '%2B').replace(/\"/g, '%22').replace(/\'/g, '%27').replace(/\//g, '%2F');        strReturn = strReturn.replace(/\+/g, '%20');        return unescape(strReturn);    },    getStringParam: function(strParamName, strParamString)    {        var strReturn = "";        var strHref = strParamString.toUpperCase();        var bFound = false;        var cmpstring = strParamName.toUpperCase() + "=";        var cmplen = cmpstring.length;        var strQueryString = strHref;        var aQueryString = strQueryString.split("&");        for (var iParam = 0; iParam < aQueryString.length; iParam++)        {            if (aQueryString[iParam].substr(0, cmplen) == cmpstring)            {                var aParam = aQueryString[iParam].split("=");                strReturn = aParam[1];                bFound = true;                break;            }        }        if (bFound == false) return null;        return strReturn;    }});