AI代码解释 functioncheckPermission(permission:string){returnfunction(target:any){constoriginalConstructor=target;constnewConstructor=function(...args:any[]){// 检查用户权限的逻辑if(!hasPermission(permission)){thrownewError(`没有权限进行操作:${permission}`);}returnneworiginalConstructor(...args);};newC...
constructor(theName: string) { = theName; } } let animal = new Animal(“Goat”); let rhino = new Rhino(); let employee = new Employee(“Bob”); animal = rhino; animal = employee; // Error: Animal and Employee are not compatible 这个例子中有Animal和Rhino两个类,Rhino是Animal类的子类。
console.log(a.constructor === A) //true console.log(a.constructor === Array) //false 1. 2. 3. 4. b:从实例新建另一个实例 function A() {}; var a = new A(); var b = new a.constructor(); //从a.constructor间接调用构造函数。 console.log(b instanceof A); //true 1. 2. 3...
classPoint{x:number;y:number;// Normal signature with defaultsconstructor(x=0,y=0){this.x=x;this.y=y;}} class Point { // Overloads constructor(x: number, y: string); constructor(s: string); constructor(xs: any, y?: any) { // TBD } } 类构造函数签名和函数签名之间只有一些区别:...
classShape{area:number;color:string;constructor(name:string,width:number,height:number){this.area=width*height;this.color="pink";};shoutout(){return"I'm "+this.color+" "+this.name+" with an area of "+this.area+" cm squared.";}}varsquare=newShape("square",30,30);console.log(square...
TypeScript - 构造函数 constructor class Dog {//需要先定义,才能在constructor中this指向name: string; age: number;//构造函数,会在对象创建时调用//new Dog() 的时候,就会调用constructorconstructor(name:string, age:number) {/** * 在实例方法中,this就表示当前的实例...
classstudent{name:stringconstructor(){//new的时候回去执行这个constructorthis.name='haohaoxuexi'}eat(){console.log(this.name)}}复制代码 2、类的继承 继承和js的继承类似一个extends即可 代码语言:javascript 代码运行次数:0 运行 AI代码解释 classTeacherextendsstudent{publicsayBye(){//此处就能拿到父类的方法...
class Star { constructor() { // init somethings } } // 此时这里的example参数它的类型为 Star 类类型而非实例类型 // 它表示接受一个构造函数 这个构造函数new后会返回Star的实例类型 function counter(example: new () => Star) { // do something } // 直接传入类 counter(Star) infer 定义 inf...
constructor(name: string, play_count: number= 12, create_at: string) {//this 指向生成点 Object 本身this.name =name;this.play_count =play_count;this.create_at =create_at; }//methods 可以对 data 进行操作display_play_count(padding: string = '***') {returnthis.play_count + '次' +pad...
constructor(name: string, resItem: cc.Prefab, conut: number) { this.name = name this.pool = new cc.NodePool(); this.resItem = resItem; for (let i = 0; i < conut; i++) { let obj: cc.Node = this.getNode(); // 创建节点 ...