二、Const关键字

（一）声明常量

const ikuko = "郁子";
console.log(ikuko);

（二）特性

1.一定要赋初始值

const A;
// Missing initializer in const declaration

2.一般常量使用大写（潜规则）

const a = 100; // 不推荐
const A = 100; // 推荐

3.常量值不可修改

ikuko = "樱井";
// Assignment to constant variable.

4.块级作用域

{
  const PLAYER = "UZI";
}
console.log(PLAYER);
// PLAYER is not defined

5.对于数组和对象的元素修改不算做对常量的修改，不会报错

• 因为当前数组或对象指向的内存地址不发生改变

const TEAM = ["UZI", "MXLG", "Ming", "Letme"];
TEAM.push("Meiko"); // ok
console.log(TEAM);

TEAM = 100; // Assignment to constant variable.