tuple元组&数组

1. 和数组类似，限制值的类型
2. 聚合不同的数据类型 ```typescript let per:[number,string]; per = [18,”Thomas”];

const user: [string, number] = [‘lucy’, 200]

user.push(300) // 只能push string，number，联合类型，其他类型报错

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## 数组
数组的两种写法
1. number[]
1. Array<number>
```typescript
const arrOfNumber: number[] = [1, 2, 3]
const arrOfNumber: Array<number> = [1, 2, 3]
arrOfNumber.push(100)
arrOfNumber.push('123') // 报错