class MyBook { bname: string; // 属性 constructor(bname: string) { this.bname = bname; } get name() { return this.bname; } set name(value) { this.bname = value; } } let myBook = new MyBook('ts'); myBook.name = 'js'; console.log(myBook.name); 参数属性 class MyBook...
Object.create(b):((__.prototype=b.prototype),new__());};varAnimal=(function(){functionAnimal(name){this.name=name;}returnAnimal;})();varCat=(function(_super){__extends(Cat,_super);functionCat(){_super.
let value1: unknown = value; // OK let value2: any = value; // OK let value3: boolean = value; // Error let value4: number = value; // Error let value5: string = value; // Error let value6: object = value; // Error let value7: any[] = value; // Error let value8:...
/*** Parses a JSON file.** @param path - Full path to the file.* @returns An object containing the JSON data.** @example Parsing a basic JSON file** # Contents of `file.json`* ```json* {* "exampleItem": "text"* }* ```** # Usage* ```ts* const result = parseFile("f...
export class AddTodoOutput extends ObjectType { todos = { description: 'Todo list', [Type]: Nullable(TodoList), } } 如上,当后端的 addTodo 接口改变了返回值类型,从非空的 todos 变成可空的 todos,这是一种不兼容的变更。 前端同步 RPC-BFF 的接口契约后,在代码编辑器里立即可以看到类型系统的 t...
export type BasicPrimitive = number | string | boolean; export function doStuff(value: BasicPrimitive) { if (Math.random() < 0.5) { return undefined; } return value; } We can see what happens in the TypeScript playground. While we might want TypeScript to display the return type of doSt...
小object:代表的是非原始类型的类型,也就是不能是string,number,boolean,symbol,严格模式:多包括null,undefined let obj1: object = 3; // 报错 let obj2: object = "3"; // 报错 let obj3: object = true; // 报错 let obj4: object = null; // 报错 ...
A naive bundler might always create a function to establish scope for every module, and place exports on a single object. It might look something like the following: Copy // Runtime helpers for bundle:functionregister(moduleName,module) {/*...*/}functioncustomRequire(moduleName) {/*...*/...
In the example, we explicitly type theorganizationvariable to the following:{[key:string]:string}, which allows this type to have properties with any string key and string value. We might be used to object types having fixed property types: ...
letvalue_b:boolean=true;// 或者 let value_b = trueletvalue_n:number=42;// 或者 let value_n = 42letvalue_o1:Object=true;letvalue_o2:Object=42; 相关约束 强制进行严格类型检查 使用class而非具有call signature的类型 规则:arkts-no-call-signatures ...