// es6function ajax1({url = 'aaa.html', method = 'get', async = true,cache}) {    console.log(url);    console.log(method);    console.log(async);    console.log(cache);}ajax1({cache:false});// es5function ajax1(_ref) {    var _ref$url = _ref.url,        url = _ref$url === undefined ? 'aaa.html' : _ref$url,        _ref$method = _ref.method,        method = _ref$method === undefined ? 'get' : _ref$method,        _ref$async = _ref.async,        async = _ref$async === undefined ? true : _ref$async,        cache = _ref.cache;    console.log(url);    console.log(method);    console.log(async);    console.log(cache);}ajax1({ cache: false });复制代码

对象传入方式，优点：有键值锁定，可以单独得传入特定参数，推荐使用

// es6function ajax(url = 'aaa.html', method = 'get', async = true,cache) {    console.log(url);    console.log(method);    console.log(async);    console.log(cache);}ajax();// es5'use strict';function ajax() {    var url = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : 'aaa.html';    var method = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 'get';    var async = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : true;    var cache = arguments[3];    console.log(url);    console.log(method);    console.log(async);    console.log(cache);}ajax();复制代码

普通传入方式，缺点：参数没有键值，不能选择性的传入特定参数，不推荐使用