JS 功能函数

//************************************* 
//读取Url中参数的函数 
//*************************************
function getUrlParameter(seekParameter) {
    var url = location.href;
    var parameters = url.substr(url.indexOf("?") + 1);
    var parameterItems = parameters.split("&");
    var parameterName;
    var parameterVar = "";
    for (i in parameterItems) {
        parameterName = parameterItems[i].split("=")[0];
        parameterVar = parameterItems[i].split("=")[1];
        if (parameterName == seekParameter) {
            return (parameterVar);
        }
    }
    return "";
}
//************************************* 
//修改Url中参数的函数 
//*************************************
function setUrlParam(url, param, v) {
    var re = new RegExp("(\\\?|&)" + param + "=([^&]+)(&|$)", "i");
    var m = url.match(re);
    if (m) {
        return (url.replace(re, function ($0, $1, $2) { return ($0.replace($2, v)); }));
    }
    else {
        if (url.indexOf('?') == -1)
            return (url + '?' + param + '=' + v);
        else
            return (url + '&' + param + '=' + v);
    }
}