JS 获取URL（query）参数

第一种

function getQueryParam(key) {
    if (!key) {
        return false;
    }

    var value = '';
    var paramStr = window.location.search ? window.location.search.substr(1) : '';

    if (paramStr) {
        paramStr.split('&').forEach(function (param) {
            var arr = param.split('=');
            if (arr[0] == key) {
                value = arr[1];
            }
        });
    }

    return value;
}

var url='localhost:8080?name=test&age=20';
getQueryParam(name)  // test

第二种

const getQueryParam = (key) => {
        const reg = new RegExp('(^|&)' + key + '=([^&]*)(&|$)', 'i');
        const r = window.location.search.substr(1).match(reg);
        console.log(r)
        if (r != null) {
            return decodeURI(r[2]);
        }
        return null;
  }