2、Array和Tuple

let arrayOfNumbers: number[] = [1, 2]
arrayOfNumbers.push(3)
arrayOfNumbers.push('str')  //报错
function test() {
  console.log(arguments)  /// IArgument
  // arguments.forEach // 报错了
}
let user: [string, number] = ['kip', 32]  //元组
user = ['kip1', 23, true] // 报错
user = ['kip1', true, 23] // 报错