Typescript

typescript学习笔记

---

boolean 布尔

• let isDone: boolean = true;
• let isFinish: boolean = false;

1. let isNew: boolean = false;
2. let isOld: boolean = true;

---

number 数子支持进制数

• let decLiteral: number = 6;
• let hexLiteral: number = 0xf00d;
• let binaryLiteral: number = 0b1010;
• let octalLiteral: number = 0o744;

元组 已知元素类型和数量的数组

• let x:[sting, number] x=['hello',10]

枚举类型 enum

• enum Color {red, green, blue} let c: Color = Color.green

任意类型 any

• let list: any[] = [1, true, 'free']

空值 void 没有任何类型

never类型

Object 类型 非原始类型

类型断言

• let someValue: any = 'this is a string'; let len: number = (<string>someVale).length let len: number = (someValue as string).length