1 wx.login({
2     success: res => {
3         // 发送 res.code 到后台换取 openId, sessionKey, unionId
4        console.log(res.code);
5        wx.request({
6            url: 'https://20210330.zhangqx.com/getcode',
7            data: {
8                code: res.code
9            },
10            header: {
11                'content-type': 'application/json' // 默认值
12            },
13            success (res) {
14                console.log(res.data);
15            }
16        })
17    }
18 })

var person = {
  firstName: "Bill",
  lastName : "Gates",
  id       : 648,
  fullName : function() {
    return this.firstName + " " + this.lastName;
  }
};

原始写法：
function (param1, param2, …, paramN){
    statements
}

箭头函数语法：

(param1, param2, …, paramN) => { statements }

(param1, param2, …, paramN) => expression
//相当于：(param1, param2, …, paramN) =>{ return expression; }

// 当只有一个参数时，圆括号是可选的：
(singleParam) => { statements }
singleParam => { statements }

// 没有参数的函数应该写成一对圆括号。
() => { statements }

x="my name 'is' xxx" 

x="my name \"is\" xxx"

x1 ='my name "is" xxx'

var o = {
	method() {
		return "Hello!";
	}
};
//  等同于
var o = {
	method: function() {
		return "Hello!";
	}
};

var foo = 'bar';
var baz = {foo};
//  等同于
var baz = {foo: foo};