import { member1 , member2 as alias2 , [...] } from "module-name"; import defaultMember, { member [ , [...] ] } from "module-name"; import defaultMember, * as name from "module-name"; import "module-name"; name 用来接收导入的值的对象的名称; member, memberN 要导入的外部模块...
import与export对应, 用于导入其它文件(模块)导出的函数, 对象或者其他基础类型, 语法如下: 代码语言:javascript 复制 importdefaultMemberfrom"module-name";import*asnamefrom"module-name";import{member}from"module-name";import{memberasalias}from"module-name";import{member1,member2}from"module-name";import{...
classCalculator{add(a:number,b:number):number;add(a:string,b:string):string;add(a:string,b:number):string;add(a:number,b:string):string;add(a:Combinable,b:Combinable){if(typeofa==='string'||typeofb==='string'){returna.toString()+b.toString();}returna+b;}}constcalculator=newCalcul...
在导入时,我们还可以使用as关键字为导入的成员指定别名,这在避免命名冲突或简化代码时非常有用: // 使用别名导入变量import{ myVariableasvariableAlias }from'./myModule';console.log(variableAlias);// 输出:Hello, TypeScript!// 使用别名导入默认导出的类importDefaultClassasMyCustomClassfrom'./myModule';con...
"@/something"改写成import foo from "./src/something"（如果你真需要这个，可以考虑使用tsc-alias）...
// type用于定义类型别名(type alias) type IDType = string | number | boolean type PointType = { x: number y: number z?: number } function printId(id: IDType) { } function printPoint(point: PointType) { } 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 类型断言as //...
yarnadd-D@babel/plugin-proposal-class-properties@babel/plugin-proposal-object-rest-spread 这里如果读者有时间,我推荐这篇深入了解babel的文章:一口(很长的)气了解 babel - 知乎 (zhihu.com)。当然,如果这口气憋不住(哈哈),我做一个简单摘抄: babel 总共分为三个阶段:解析,转换,生成。
TypeScript allows us to mark a class asabstract. This tells TypeScript that the class is only meant to be extended from, and that certain members need to be filled in by any subclass to actually create an instance. Copy abstractclassShape{abstractgetArea():number;}// Error! Can't instanti...
TypeScript中的数据存储typescriptimport TypeScript是一种基于结构类型的语言,可根据其成员来描述类型。以结构相同的Person接口和Programmer类为例,如下所示。interface Person { name: string; } class Programmer { name: string; } let person: Person = new Programmer(); 由于结构类型的关系,因此当变量 ...
import { Entity, PrimaryGeneratedColumn, Column } from "typeorm" @Entity() export class User { @PrimaryGeneratedColumn() id: number @Column() firstName: string @Column() lastName: string @Column() age: number }And your domain logic looks like this:const userRepository = MyDataSource.get...