前言：ts 对数据类型进行约束及检测。比如：数据约束了是 number 值，给它赋值 string 或 boolean 值时，ts 会报错。
1. ts 数据类型
布尔值、数字、字符串、数组、元组、枚举、Any、Void、Null、Undefined、Nerver、Object、类型断言
2. 例子
// 布尔值
let tsBoolean: boolean = false;
// 数字
let tsNumber: number = 123;
// 字符串
let tsString: string = "abc";
// 数组
let tsListNum: number[] = [1, 2, 3, 4];
let tsListStr: string[] = ["A", "B", "C", "D"];
let tsListMix: any[] = ["A", 1, "B", 2, { a: 12 }];
let tsLintStr2: Array<string> = ["A", "B", "C", "D"];
// 元组
let tsTuple: [string, number] = ["AA", 222];
// 枚举
enum Color {
Red,
Green,
Pink,
}
let tsEnum: Color = Color.Green;
// Null
let tsNull: null = null;
// Undefined
let tsUndefined: undefined = undefined;
// Object
let tsObject: object = { a: "aaaa" };
// Void
function tsVoidFun(a: string, b: string): void {
console.log(a + b);
}
// Nerver
function error(message: string): nerver {
throw new Error(message);
}
// 类型断言
let strLength: number = (someValue as string).length;
