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变量,常量,数据类型, 函数
冷风
Original
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变量,常量,数据类型, 函数

变量

  • 用let声明,它第一次赋值叫初始化,第二次叫更新
  1. let Abc = "123456";
  2. Abc = "23456";
  3. console.log(Abc);

常量

  • 常量不能被更新,所以必须给予赋值
  1. const Ac = "5555";

数据类型

  • 数据类型有原始类型,引用函数,引用对象,引用数组
  1. 原始类型
  2. const Ac = "name";
  3. 函数也是对象,函数也可以当成值来传递和引用
  4. function Ac(a, b, c) {}
  5. console.dir(Ac);
  6. Ac.email = "123456@qq.com";
  7. 引用对象
  8. const Ac = {
  9. name: "1111",
  10. gender: "2222",
  11. job: "3333",
  12. getName: function () {
  13. return this.name;
  14. },
  15. };
  16. 引用数组
  17. const Ac = ["111", "222", "333"];

函数参数与返回值

  1. let Ac = function (...arr) {
  2. return arr.reduce((p, c) => p + c);
  3. };
  4. console.log(Ac(1, 2, 3, 4, 5));

匿名函数及箭头函数的转化

  1. let Ac = (a, b) => {
  2. return a + b;
  3. };
  4. console.log(Ac(10, 10));
Correcting teacher:PHPzPHPz

Correction status:qualified

Teacher's comments:箭头函数的简化可以使得代码看起来更加简洁
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