JS操作URL

function getQueStr(url, ref) //取获参数值
{
    var str = url.substr(url.indexOf('?') + );
    if (str.indexOf('&') != -) {
        var arr = str.split('&');
        for (i in arr) {
            if (arr[i].split('=')[] == ref)
                return arr[i].split('=')[];
        }
    }
    else {
        return url.substr(url.indexOf('=') + )
    }
}

function setQueStr(url, ref, value) //设置参数值
{
    var str = "";
    if (url.indexOf('?') != -)
        str = url.substr(url.indexOf('?') + );
    else
        return url + "?" + ref + "=" + value;
    var returnurl = "";
    var setparam = "";
    var arr;
    var modify = "";

    if (str.indexOf('&') != -) {
        arr = str.split('&');

        for (i in arr) {
            if (arr[i].split('=')[] == ref) {
                setparam = value;
                modify = "";
            }
            else {
                setparam = arr[i].split('=')[];
            }
            returnurl = returnurl + arr[i].split('=')[] + "=" + setparam + "&";
        }

        returnurl = returnurl.substr(, returnurl.length - );

        if (modify == "")
            if (returnurl == str)
                returnurl = returnurl + "&" + ref + "=" + value;
    }
    else {
        if (str.indexOf('=') != -) {
            arr = str.split('=');

            if (arr[] == ref) {
                setparam = value;
                modify = "";
            }
            else {
                setparam = arr[];
            }
            returnurl = arr[] + "=" + setparam;
            if (modify == "")
                if (returnurl == str)
                    returnurl = returnurl + "&" + ref + "=" + value;
        }
        else
            returnurl = ref + "=" + value;
    }
    return url.substr(, url.indexOf('?')) + "?" + returnurl;
}

function delQueStr(url, ref) //删除参数值
{
    var str = "";

    if (url.indexOf('?') != -)
        str = url.substr(url.indexOf('?') + );
    else
        return url;
    var arr = "";
    var returnurl = "";
    var setparam = "";
    if (str.indexOf('&') != -) {
        arr = str.split('&');
        for (i in arr) {
            if (arr[i].split('=')[] != ref) {
                returnurl = returnurl + arr[i].split('=')[] + "=" + arr[i].split('=')[] + "&";
            }
        }
        return url.substr(, url.indexOf('?')) + "?" + returnurl.substr(, returnurl.length - );
    }
    else {
        arr = str.split('=');
        if (arr[] == ref)
            return url.substr(, url.indexOf('?'));
        else
            return url;
    }
}