functionsetAge(age:string|number){console.log('我的年纪是'+age.toString());} 2、判断类型,分别处理达到函数目的 代码语言:javascript 代码运行次数:0 运行 AI代码解释 functionsetAge(age:string|number){if(typeofage==="string"){console.log('我是字
functionchangeDirection(direction:'up'|'down'|'left'|'right'){console.log(direction)}changeDirection('left') 参数direction的值只能是up/down/left/right中的任意一个相比与string类型,使用字面类型更加精确、严谨 枚举 枚举的功能类似于字面类型+联合类型组合的功能,也可以表示一组明确的可选值枚举:定义一组...
function error(msg: string): never { throw new Error('我报错了'); // 直接异常结束了 } function loop(): never { while (true) {} } function fn(x: number | string) { if (typeof x === 'number') { // 类型保护 console.log(x); } else if (typeof x === 'string') { consol...
}//使用组件type IProps ={ name: string; age: number; };<MyComponent<IProps> name="React" age={18} />; //Success<MyComponent<IProps> name="TypeScript" age="hello" />; // Error 2. 函数组件 通常情况下,函数组件我是这样写的: interface IProps { name: string } const App= (props...
Type '[string, number, string]' is not assignable to type '[string, number]'. */ Any (任意值) any 与类型系统中的任何类型都兼容。意味着可以将任何内容赋值给它,也可以将它赋值给任何类型。它能让你避开类型检查。 let variable: any = 'a string'; variable = 5; variable = false; variable....
You can read more about the change on GitHub. The NoInfer Utility Type When calling generic functions, TypeScript is able to infer type arguments from whatever you pass in. Copy function doSomething<T>(arg: T) { // ... } // We can explicitly say that 'T' should be 'string'. do...
type UppercaseGreeting = "HELLO WORLD"; type UncomfortableGreeting = Uncapitalize<UppercaseGreeting>; // 相当于 type UncomfortableGreeting = "hELLO WORLD" typescript 本文系转载,阅读原文 https://zhuanlan.zhihu.com/p/640499290 阅读837更新于2024-01-26 ...
@Watch("$route",{immediate:true})privateonRouteChange(route:Route){constquery=route.queryasDictionary<string>;if(query){this.redirect=query.redirect;this.otherQuery=this.getOtherQuery(query);}} @Watch(path: string, options: WatchOptions = {}) ...
lsprefers to the language server protocol types,tsprefers to the typescript server protocol types. Go to Source Definition Request: {command:`_typescript.goToSourceDefinition`arguments:[lsp.DocumentUri,// String URI of the documentlsp.Position,// Line and character position (zero-based)]} ...
截止2023-05,Typedoc 更新了 0.24 版本,正文中涉及的脚本需要有以下调整,以适应新版本的 breakchange。 脚本代码修改: // doc/typedoc.js const TypeDoc = require('typedoc'); const path = require('path'); const fs = require('fs'); // 根目录 ...