AI代码解释 constnameDecorate:PropertyDecorator=(target:Object,propertyKey:string|symbol)=>{letvalue:string Object.defineProperty(target,propertyKey,{set:(v)=>{value=v},get:()=>{return'寒冰射手'+value}})}classHero{@nameDecoratename:string}lethb=newHero()hb.name='艾希'console.log(hb.name); ...
type Name=string;typeNameResolver=()=>string;type NameOrResolver=Name|NameResolver;functiongetName(n:NameOrResolver):Name{if(typeofn==='string'){returnn}else{reutrnn()}} 类型Name其实就是string的别名,类型() => string,一个函数返回一个字符串,这种格式就是类型NameResolver,NameOrResolver是一个...
radius: 42 }); // oopsdraw({ color: "red", raidus: 42 });// Argument of type '{ color: string; raidus: number; }' is not assignable to parameter of type 'Colorful & Circle'.// Object literal
let infinite=Infinity; console.log(typeofnum1);//numberconsole.log(typeofstr1,);//stringconsole.log(typeofisTrue);//booleanconsole.log(typeofundefinedVar);//undefinedconsole.log(typeofnullVar);//objectconsole.log(typeofsymbol1);//symbolconsole.log(typeofbigIntNum);//bigintconsole.log(type...
In the object deconstruction grammar,shape: Shaperepresents the assignment of the value ofshapeShape.xPos: numberis the same, it will create a variablenumberxPos readonlyproperty (readonly Properties) In TypeScript, attributes can be marked asreadonly, which will not change any runtime behavior...
typescript 對象中添加元素 typescript object object Typescript基础(一) 我们为啥不继续使用js,学ts是无意义的内卷吗? 安装TypeScript 编译一个 TypeScript 文件 通过一个函数理解ts的基本使用 原始数据类型在ts中的show time 布尔值 字符串 空值 Null 和 Undefined...
* `useRef` returns a mutable ref object whose `.current` property is initialized to the passed argument * (`initialValue`). The returned object will persist for the full lifetime of the component. * * Note that `useRef()` is useful for more than the `ref` attribute. It’s handy for...
在JavaScript 中,最基本的将数据成组和分发的方式就是通过对象。在 TypeScript 中,我们通过对象类型(object types)来描述对象。 对象类型可以是匿名的: functiongreet(person:{name:string;age:number}){return"Hello "+person.name;} 也可以使用接口进行定义: ...
// 类型安全 buyPekingDuck(dollar) // Argument of type 'USD' is not assignable to parameter of...
interface setItemsType<T> {[propName: string]: T;}private items: setItemsType<T>;constructor() {this.items = {};} 实现判断元素是否存在于集合中函数(has) has(element: any){// Object原型有hasOwnProperty方法用于判断对象是否有特定属性returnObject.prototype.hasOwnProperty.call(this.items,element...