TypeScript的基本数据类型

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Boolean
Number
String
Array
Enum //枚举
Any //不知道数据类型
Void //声明函数 可以不需要返回值

let isDone: boolean = false;
Number
let decimal: number = 6;
let hex: number = 0xf00d;
let binary: number = 0b1010;
let octal: number = 0o744;
String
let color: string = "blue";
color = 'red';
Array
let list: number[] = [1, 2, 3];
let list: Array<number> = [1, 2, 3];
Tuple
// Declare a tuple type
let x: [string, number];
// Initialize it
x = ["hello", 10]; // OK
// Initialize it incorrectly
x = [10, "hello"]; // Error
Enum
enum Color {Red, Green, Blue}
let c: Color = Color.Green;

enum Color {Red = 1, Green, Blue}
let c: Color = Color.Green;

enum Color {Red = 1, Green = 2, Blue = 4}
let c: Color = Color.Green;
enum Color {Red = 1, Green, Blue}
let colorName: string = Color[2];

alert(colorName); // Displays 'Green' as its value is 2 above
Any
let notSure: any = 4;
notSure = "maybe a string instead";
notSure = false; // okay, definitely a boolean

let notSure: any = 4;
notSure.ifItExists(); // okay, ifItExists might exist at runtime
notSure.toFixed(); // okay, toFixed exists (but the compiler doesn't check)

let prettySure: Object = 4;
prettySure.toFixed(); // Error: Property 'toFixed' doesn't exist on type 'Object'.

let list: any[] = [1, true, "free"];

list[1] = 100;
Void

function warnUser(): void {
    alert("This is my warning message");
}

let unusable: void = undefined;
Null and Undefined
// Not much else we can assign to these variables!
let u: undefined = undefined;
let n: null = null;

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