TypeScript中数组类型的定义

一般数组类型的定义

// 类型推断
const numberArr = [1, 2, 3];
// 类型注释
const numberArr: number[] = [1, 2, 3];
const stringArr: string[] = ["a", "b", "c"];
const undefinedArr: undefined[] = [undefined, undefined];
// 存在多种类型
const arr: (number | string)[] = [1, "string", 2];

数组中对象类型的定义

const xiaoJieJies: { name: string, age: Number }[] = [
  { name: "刘英", age: 18 },
  { name: "谢大脚", age: 28 },
];

// 使用 type 类型别名定义
type Lady = { name: string, age: Number };

const xiaoJieJies: Lady[] = [
  { name: "刘英", age: 18 },
  { name: "谢大脚", age: 28 },
];

// 使用 class 类定义
class Madam {
  name: string;
  age: number;
}

const xiaoJieJies: Madam[] = [
  { name: "刘英", age: 18 },
  { name: "谢大脚", age: 28 },
];

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参考：
技术胖——TypeScript从入门到精通（06. TypeScript中数组类型的定义）