javascript取url参数的几种方法

//获取QueryString的数组
function getQueryString() {
    var result = location.search.match(new RegExp("[\?\&][^\?\&]+=[^\?\&]+", "g"));
    if (result == null) {
        return "";
    }
    for (var i = 0; i < result.length; i++) {
        result[i] = result[i].substring(1);
    }
    return result;
}
//根据QueryString参数名称获取值
function getQueryStringByName(name) {
    var result = location.search.match(new RegExp("[\?\&]" + name + "=([^\&]+)", "i"));
    if (result == null || result.length < 1) {
        return "";
    }
    return result[1];
}
//根据QueryString参数索引获取值
function getQueryStringByIndex(index) {
    if (index == null) {
        return "";
    }
    var queryStringList = getQueryString();
    if (index >= queryStringList.length) {
        return "";
    }
    var result = queryStringList[index];
    var startIndex = result.indexOf("=") + 1;
    result = result.substring(startIndex);
    return result;
}
alert(getQueryString())
alert(getQueryStringByName("user"))
alert(getQueryStringByIndex("0"))
alert(getQueryStringByIndex("1"))

//取页面参数1
如url:http://sh2.changyou.com/info/result.shtml?key=xxx
function getQueryString(name) {
    var reg = new RegExp("(^|\\?|&)"+ name +"=([^&]*)(\\s|&|$)", "i");
    if (reg.test(location.href)){
        var tmp =  decodeURI(RegExp.$2.replace(/\+/g, " "));
        return tmp;
    }
    return "";
}
var searchs_key;
searchs_key = getQueryString(‘key‘);
//取页面参数2
// 获取地址栏的参数数组
function getUrlParams()
{
    var search = window.location.search ;
    // 写入数据字典
    var tmparray = search.substr(1,search.length).split("&");
    var paramsArray = new Array;
    if( tmparray != null)
    {
        for(var i = 0;i<tmparray.length;i++)
        {
            var reg = /[=|^==]/;    // 用=进行拆分，但不包括==
            var set1 = tmparray[i].replace(reg,‘&‘);
            var tmpStr2 = set1.split(‘&‘);
            var array = new Array ;
            array[tmpStr2[0]] = tmpStr2[1] ;
            paramsArray.push(array);
        }
    }
    // 将参数数组进行返回
    return paramsArray ;
}

// 根据参数名称获取参数值
function getParamValue(name)
{
    var paramsArray = getUrlParams();
    if(paramsArray != null)
    {
        for(var i = 0 ; i < paramsArray.length ; i ++ )
        {
            for(var  j in paramsArray[i] )
            {
                if( j == name )
                {
                    return paramsArray[i][j] ;
                }
            }
        }
    }
    return null ;
}