js 获取 url 地址参数

思路:

• 通过location的search就可以获取到url中问号后面的值。
• 字符串过滤到问号
• 通过split方法分割参数集合
• 循环赋值
• 匹配对应的参数值
• 返回值

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;
}

实例

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); // 1

其他

window.location:

eg:
http://localhost:8086/topic/index?topicId=361

• console.log(window.location.host)：输出：http:localhost:8086

• console.log(window.location.href);：输出：http://localhost:8086/topic/index?topicId=361

• console.log(window.location.pathname);：输出：/topic/index

• console.log(window.location.port)：输出：8086

• console.log(window.location.protocol);：输出： http:

• console.log(window.location.search);：输出：?topicId=361

参考:

1. https://zhuanlan.zhihu.com/p/72581171
2. https://www.jianshu.com/p/0efc0b5ab157