首先,我们需要创建一个包含静态变量的类。我们可以使用 TypeScript 的 class 关键字来定义一个类,并在类中定义一个静态变量。 classMyClass{staticmyStaticVariable:string="Hello";} 1. 2. 3. 在上面的代码中,我们定义了一个名为myStaticVariable的静态变量,并将其初始值设为"Hello"。 步
Ts扩展了js类,包括类型参数(type parameters)、实现子语句(implements clauses)、可访问性修饰符(accessibility modifiers)、成员变量声明(member variable declarations)和构造器参数特性声明(parameter property declarations in constructors)。 8.1 类声明(Class Declarations) 类声明声明一个类类型(class type)和一个构造...
System.out.println(supStaticVariable); System.out.println( "父类的静态初始化块" ); } /* 初始化块 */ { System.out.println(supVariable); System.out.println( "父类的初始化块" ); } /* 构造器 */ public SuperClass() { System.out.println( "父类的无参构造器" ); System.out.println( ...
classAnimal{publicname;privateconstructor(name){this.name=name;}}classCatextendsAnimal{constructor(name){super(name);}}leta=newAnimal('Jack');// index.ts(7,19): TS2675: Cannot extend a class 'Animal'. Class constructor is marked as private.// index.ts(13,9): TS2673: Constructor of cla...
在TypeScript 中,我们可以通过Class关键字来定义一个类: classGreeter{// 静态属性staticcname:string="Greeter";// 成员属性greeting:string;// 构造函数 - 执行初始化操作constructor(message:string){this.greeting=message;}// 静态方法staticgetClassName(){return"Class name is Greeter";}// 成员方法greet()...
与variable:type类似,这是另外一种类型约束。 如果不明白的花,看完下面这个demo就明白了。 type keys = 'foo' | 'bar' | 'baz' const obj = { foo: 'a', bar: 'b', baz: 'c' } const test = (key:any) => { return obj[key] ; // 提示错误 type 'any' can't be used to index ...
{ a: 1, b: "foo" }). The order in which properties are returned is order of insertion with no special regard for keys that looks like integer (JavaScript hasreally counter-intuitive behaviorhere). When we supportObject.keys()on class types, the order will be the static order of field...
any extends static let package implements interface function do try yield const continue 类型 变量类型 letx:number|null|undefined 元组 consta:[number,boolean] = [1,false]typeofa[0]// numbertypeofa['length']// 2 枚举enum 可以增加 const 定义,编译时会被编译成常量,否则会被编译成对象 ...
const serializables = new WeakMap(); type Context = | ClassAccessorDecoratorContext | ClassGetterDecoratorContext | ClassFieldDecoratorContext ; export function serialize(_target: any, context: Context): void { if (context.static || context.private) { throw new Error("Can only serialize public ...
class User { static name: string static address: string static age: number constructor(name: string, address: string, age: number) { this.name = name; this.address = address; this.age = age } public sayHello() { alert('hello from' + this.name) ...