1.  // TS
    2.     //数组
    3.     let list: number[] = [8989, 2, 555];
    4.     let ss: object[] = [{ name: "ww" }, { name: "nn" }];
    5.     // 元组
    6.     let xx: [string, number] = ["10", 20];
    7.     // 枚举
    8.     enum Color {
    9.       Red,
    10.       Green,
    11.       Blue,
    12.     }
    13.     // 显示下标
    14.     let c: Color = Color.Green;
    15.     // 显示字符串
    16.     let colorName: string = Color[0];
    18.     // Any 不确定类型
    19.     let notSure: any = 4;
    20.     notSure = "maybe a string instead";
    22.     // void 表示没有任何返回类型
    23.     let warnUser = (): void => {
    24.       console.log("结果:", "this is worning message");
    25.     };
    27.     // 声明一个void类型的变量没有什么大用 因为你只能赋予undefined
    28.     let unusable: void = undefined;
    30.     // Object
    32.     // 类型断言 清楚的知道自己在干啥
    34.     let oo: any = "this is a string";
    36.     // let strLength: number = (<String>oo).length;
    37.     // jsx  仅支持as 断言
    38.     let strLength: number = (oo as string).length;
    40.     onMounted(() => {
    41.       warnUser();
    43.       console.log("结果:", strLength);
    44.     });