This article shows how to extend a TypeScript window.TypeScript Window ObjectA window is a built-in object defined in the browser. It is the window object that contains a DOM document.You might need to access the properties and functions associated with the browser window object. The built-...
一般来说,用 TypeScript 写代码,就已经决定了要模块化,除非很少的时候需要在页面的<script> 中调用脚本中的某些对象,这种情况往 window 上挂就行。如果是要做为库来发布,tsc 是可以编译生成 .d.ts 文件的,如果是引用 js,那就不存在静态类型检查的问题;如果是引用 ts,那就以模块化的方式引用;如果想以全局的...
let name: string; namespace fn {functionextend(object: any):void} }//示例$.ajax('./url', {})//$作为函数时declarefunction$(selector: string): HTMLElement;//示例$('#root') 2. 类型声明文件 类型声明的文件的后缀为 .d.ts。 对应的tsconfig.json中的相关配置参数有: include: ["./src/**...
*/// 同理类也是必然可以继承的,但是不能多继承,不能多继承,不能多继承// 依旧关键字是extendsexportclasstest1{constructor(privatehh:string){this.hh=hh;}test(a){console.log(this.hh+a);}}exportclasstest2extend test1{publica='sfasdf';constructor(a:string){super(a);}test(){super.test();// ...
classDog{name:string='wc';say():void{console.log('wang wang');}}classCat{age:number=3;run():void{console.log('run run');}}classAnimalimplementsDog,Cat{name:string;age:number;say:()=>void;run:()=>void;}functionmyMixin(target:any,from:any[]){from.forEach((fromItem)=>{Object.get...
error(e); } }, get (key) { return window.localStorage[key]; } }; storageManager.set('pos', {x: 5, y: 8}); storageManager.get('pos'); // 这里取出来的值是[object Object] 而借助TS能够解决这种情况,就是通过设定参数的类型,如下代码所示: const storageManager = { // value必须得是...
In JavaScript, it is a runtime error to use a non-object type on the right side of the in operator. TypeScript 4.2 ensures this can be caught at design-time. Copy "foo" in 42 // ~~ // error! The right-hand side of an 'in' expression must not be a primitive. This check is...
Object spread on generic types JavaScript supports a handy way of copying existing properties from an existing object into a new one called “spreads”. To spread an existing object into a new object, you define an element with three consecutive periods (...) like so: ...
Object types in TypeScript aren't "sealed" / "closed" / "final". In other words, if you have a variable oftype{ a: string }, it's possible that the variable points to avaluelike{ a: "hello", b: 42 }. When you're directly creating an object literal, TypeScript uses "excess ...
If the only known fact about the type is that it's some object, use the type object, not Object or { [key: string]: any }. var foo: string | any: When any is used in a union type, the resulting type is still any. So, while the string portion of this type annotation may ...