声明引用类型 const 改变是否报错？
const a = [1, 2, 3]
a[0] = 4
console.log(a)
//[4,2,3]
a[3] = 5
console.log(a)
//[1,2,3,5]
答案：不会报错，const 声明的基本类型不能更改，引用类型更新不会报错
const a = [1, 2, 3]
a[0] = 4
console.log(a)
//[4,2,3]
a[3] = 5
console.log(a)
//[1,2,3,5]
答案：不会报错，const 声明的基本类型不能更改，引用类型更新不会报错