ES6 学习
2020-05-22 本文已影响0人
猪猪侠闯天下
- 块级作用域
以前定义变量用var:
var name = "张三";
现在使用let
let name = "张三"
块的概念:
if(true) {
let name = "张三";
}```
console.log(name);
会报错误:name未定义,也就是说let定义的变量只能在块级作用域中使用。
2. const 定义常量
const name = "张三";
name = "李四";
浏览器报错,不可以修改。
const list = [];
list.push("张三");
list.push
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