获取 url 中的参数

1. 指定参数名称，返回该参数的值 或者 空字符串 2. 不指定参数名称，返回全部的参数对象 或者 {} 3. 如果存在多个同名参数，则返回数组

function getUrlParam(sUrl, sKey){

    var param = sUrl.split('?')[1].split('#')[0];

    if (sKey) {

        //如果传入了sKey

        var aParam = param.split('&');

        var aRes = [];

        for(var i=0; i<aParam.length; i++){

            if(aParam[i].split('=')[0] == sKey){

                aRes.push(aParam[i].split('=')[1]);

            }

        }

        if (aRes.length == 1) {

            return aRes[0];

        } else if(aRes.length == 0){

            return '';

        } else {

            return aRes;

        }

    }else{

        //如果未传入sKey

        if(param == undefined || param == ''){

            return {};

        }else {

            var aParam = param.split('&');

            var oRes = {};

            for(var i = 0; i < aParam.length; i ++){

                var temp = aParam[i].split('=');

                oRes[temp[0]] = oRes[temp[0]] || [];

                oRes[temp[0]].push(temp[1]);

            }

            return oRes;

        }

    }

}