数组类型的定义

const numberArr: number[] = [1, 2, 3];
const stringArr: string[] = ["a", "b", "c"];
const undefinedArr: undefined[] = [undefined, undefined];

一：多种基本数据类型

const numArr: (Number|String)[] = [1,2,3,'4']

二：对象数组

// 正常情况
const xiaoJieJies: { name: string, age: Number }[] = [
  { name: "刘英", age: 18 },
  { name: "谢大脚", age: 28 },
];
// 类型别名
type Lady = { name: string, age: Number };
const xiaoJieJies: Lady[] = [
  { name: "刘英", age: 18 },
  { name: "谢大脚", age: 28 },
];
// class类
class Madam {
  name: string;
  age: number;
}
const xiaoJieJies: Madam[] = [
  { name: "刘英", age: 18 },
  { name: "谢大脚", age: 28 },
];

三：元组

// 规定数组元素顺序
const xiaojiejie: [string, string, number] = ["dajiao", "teacher", 28];