4.array数组: 方式1:var arr:number[] = [1,2,3]//制定arr里面全是数字 方式2:var arr:Array= [1,2,3] 5.元组类型(tuple) 方式1:属于数组的一种,即数组中每一个元素指定类型 方式2:var arr:[number, string]=[123,“this is ts”]; 6.枚举类型(enum) // 常用来标识状态码 enum Flag{ s...
let list: number[] = [1, 2, 3]; // ES5:var list = [1,2,3]; let list: Array<number> = [1, 2, 3]; // Array<number>泛型语法 // ES5:var list = [1,2,3]; 2.5 Enum 类型 使用枚举我们可以定义一些带名字的常量。 使用枚举可以清晰地表达意图或创建一组有区别的用例。 TypeScript ...
interfacePadder{getPaddingString():string;}classSpaceRepeatingPadderimplementsPadder{constructor(privatenumSpaces:number){}getPaddingString(){returnArray(this.numSpaces+1).join(" ");}}classStringPadderimplementsPadder{constructor(privatevalue:string){}getPaddingString(){returnthis.value;}}letpadder:Padder=...
let str: string = 'sxh'; 数组类型(array) let arr1: number[] = [ 1, 2, 3]; let arr2: Array = [1, 2, 3]; // 接口定义数组 interface IArray { [index: number]: number; } let arr: IArray = [1, 1, 2, 3, 5]; 只读数组 数组创建后不能被修改 let ro: ReadonlyArray ...
}// 无法从对象中删除某个属性,从而确保所有Point对象都具有属性xletp1 =newPoint(1.0,1.0);deletep1.x;// 在TypeScript和ArkTS中,都会产生编译时错误delete(p1asany).x;// 在TypeScript中不会报错;在ArkTS中会产生编译时错误// Point类没有定义命名为z的属性,在程序运行时也无法添加该属性letp2 =newPoi...
Object.groupBytakes an iterable, and a function that decides which "group" each element should be placed in. The function needs to make a "key" for each distinct group, andObject.groupByuses that key to make an object where every key maps to an array with the original element in it. ...
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: ...
建立实体基类(EntityElement)与配置基类(ConfigElement),都继承自Element,此目的可区分实体与配置的不同行为,比如后期实体序列化到数据库,配置序列化到JSON; 实体基类(EntityElement),抽象实体共有属性,例如ID、名称、描述等; 配置基类(ConfigElement),抽象配置共有属性,例如配置名称、配置值等; 设施(Facility)、设备(...
webContents.openDevTools();// Emitted when the window is closed.mainWindow.on('closed', () => {// Dereference the window object, usually you would store windows// in an array if your app supports multi windows, this is the time// when you should delete the corresponding element.main...
Vditor是一款浏览器端的 Markdown 编辑器,支持所见即所得、即时渲染(类似 Typora)和分屏预览模式。它使用 TypeScript 实现,支持原生 JavaScript 以及 Vue、React、Angular 和 Svelte 等框架。 欢迎到Vditor 官方讨论区了解更多。同时也欢迎关注 B3log 开源社区微信公众号B3log开源: ...