数组定义

一般来说，数组里面的元素都应该是同类型的

let a1:string[] = ["e634"]
let a2:boolean[] = [false, true]
let a3:Array<number> = [1,5,6,7]

杂乱数组

let a4:any[] = [1, "s", [123, [13]]]
let a5:(string|number)[] = [1,2,"345"]

元组

let a7: [number, number] = [1, 2]
console.log(a7[2]) // 防止越界


let a8:[1,string, true] = [1, "", true]


let scope: [string, number, number, number] = ["小明", 12, 45, 23]

多维数组

let arr1: number[][] = [[1, 2], [12]]
let arr2: Array<Array<number>> = [[1], [2]]