// 普通枚举enumGender1{Male,Female}console.log(Gender1.Male===0);// 常量枚举constenumGender2{Male,Female}console.log(Gender2.Male===0); 将如上代码用tsc进行编译得到编译之后的源代码: image-20211130221833173 发现编译之后的内容,正是我如上所说的,即可验
enum:现在想想 enum 枚举类型非常实用,很多其它的语言都内置了这一类型,合理的使用枚举,能让我们的代码可读性更高,比如: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 constenumMediaTypes{JSON="application/json"}fetch("https://swapi.co/api/people/1/",{headers:{Accept:MediaTypes.JSON}}).then(...
💻 Would you like to work on this feature? What problem are you trying to solve? @babel/plugin-transform-typescript currently turns const enums into var Foo = { Bar: 0, Baz: 1 } but I'd like it if it instead produced const variables Descr...
// $ExpectType string const result = twoslash("//")+// Handle options param+const resultWithOptions = twoslash("//", { version: "3.7" })+// When the param is incorrect+
Convert between default export and named export- Convert from using aexport defaultand having a named export (export const Foo = ...). Convert parameters to destructured object- Rewrite a function that takes a long list of arguments to take a single arguments object. ...
// Babel无法编译Const-Enums export const enum Status { ^^^ // 'const' enums are not supported. Published , Draft , } 笔者比较中意的ts-key-enum库中使用了TS的Enums来处理event.key值的引用,在版本3中变为了使用Const Enums来实现。由于笔者在其项目中使用了Babel来编译TS,因此无法使用利用了Const...
enumTheme{DEFAULT=0,LIGHT=1,DARK=2}// TypeScript 不会抛出错误consttheme:Theme.DEFAULT=3 由于这些原因,建议对枚举值使用字符串文字。Theme枚举应如下所示: enumTheme{DEFAULT='Default',LIGHT='Light',DARK='Dark'}console.log(Theme.DARK)// 'Dark'// 不能将类型 Default 分配给类型 Theme.DEFAULTletth...
// 定义一个枚举类型 enum STATUS{ OFFLINE, ONLINE, NORMAL } function getResult(status){ if(status === STATUS.OFFLINE){ return 'OFFLINE' }else if(status === STATUS.ONLINE){ return 'ONLINE' }else if(status === STATUS.NORMAL){ return 'NORMAL' } return 'ERROR' } const result = getRes...
:functiongetUrlParam(key:string){constREG_PATTERN=newRegExp('(^|&)'+key+'=([^&]*)(&|$)','i');letresult:string[]=location.search.substr(1).match(REG_PATTERN);if(result!==null){returndecodeURIComponent(result[2]);}else{returnnull;}}export{getUrlParam}:import{getUrlParam}from'./...
Interesting thing is that you can use enum as Type. This is what compile to Javscript: But if you add 'const' to enum: const enum Sizes { Small= "small", Medium= "medium", Large= "large" } It compiles to such smaller amount code, with only necessary information...