/**

 * 获取指定的URL参数值

 * URL:http://www.xxx.com/index?name=123

 * 参数：param URL参数

 * 调用方法:getParam("name")

 * 返回值:123

 * alert(getParam('date'));

 */

function getParam(name) {

    var reg = new RegExp("(^|&)" + name + "=([^&]*)(&|$)", "i");

　　//search,查询？后面的参数，并匹配正则

    var r = location.search.substr(1).match(reg);

　　if (r != null) return decodeURI(decodeURI(r[2]));

}

/**

 * js获取url参数值
 * 思路，通过location的search获取url中问号后面的值，字符串过滤掉问号，再通过split方法分割参数集合、循环赋值、匹配对应的参数，最后返回值

 * URL:http://www.xxx.com/index?name=123

 * 参数：param URL参数

 * 调用方法:getUrlParams("name")

 * 返回值:123

 * alert(getUrlParams('date'));

 */

function getUrlParams(name) { // 不传name返回所有值，否则返回对应值

    var url = window.location.search;

    if (url.indexOf('?') == 1) { return false; }

    url = url.substr(1);

    url = url.split('&');

    var name = name || '';

    var nameres;

    // 获取全部参数及其值

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

        var info = url[i].split('=');

        var obj = {};

        obj[info[0]] = decodeURI(info[1]);

        url[i] = obj;

    }

    // 如果传入一个参数名称，就匹配其值

    if (name) {

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

            for (const key in url[i]) {

                if (key == name) {

                    nameres = url[i][key];

                }

            }

        }

    } else {

        nameres = url;

    }

    // 返回结果

    return nameres;

}

const url = 'http://www.abc.com/test.php?id=1&from=index';

var res = getUrlParams();

var res1 = getUrlParams('id');

console.log(res); //  [{id: "1"}, {from: "index"}]

console.log(res1); //

/**

 * [获取URL中的参数名及参数值的集合]

 * 示例URL:http://htmlJsTest/getrequest.html?uid=admin&rid=1&fid=2&name=小明

 * @param {[string]} urlStr [当该参数不为空的时候，则解析该url中的参数集合]

 * @return {[string]}       [参数集合]

 */

function GetRequest(urlStr) {

    if (typeof urlStr == "undefined") {

        var url = decodeURI(location.search); //获取url中"?"符后的字符串

    } else {

        var url = "?" + urlStr.split("?")[1];

    }

    var theRequest = new Object();

    if (url.indexOf("?") != -1) {

        var str = url.substr(1);

        strs = str.split("&");

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

            theRequest[strs[i].split("=")[0]] = decodeURI(strs[i].split("=")[1]);

        }

    }

    return theRequest;

}

 var parms_1 = GetRequest();

2 console.log(parms_1); // {"uid":"admin","rid":"1","fid":"2","name":"小明"}

3 console.log(parms_1['name']); // '小明'

4 var parms_2 = GetRequest('http://htmlJsTest/getrequest.html?uid=admin&rid=1&fid=2&name=小明');

5 console.log(parms_2); // {"uid":"admin","rid":"1","fid":"2","name":"小明"}

6 console.log(parms_2['name']); // '小明'

/**

 * [通过参数名获取url中的参数值]

 * 示例URL:http://htmlJsTest/getrequest.html?uid=admin&rid=1&fid=2&name=小明

 * @param  {[string]} queryName [参数名]

 * @return {[string]}           [参数值]

 */

function GetQueryValue(queryName) {

    var query = decodeURI(window.location.search.substring(1));

    var vars = query.split("&");

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

        var pair = vars[i].split("=");

        if (pair[0] == queryName) { return pair[1]; }

    }

    return null;

}

1 var queryVal=GetQueryValue('name');

2 console.log(queryVal);// 小明