function processData(data: any): void { // 对数据进行处理 console.log(data); } processData("Hello"); // 输出:Hello processData(123); // 输出:123 processData(true); // 输出:true 在上述示例中,processData函数接受一个data参数,并使用<any>类型注解表示该参数可以是任意类型。因此,可以传入字符串...
函数重载示例 functioncombine(input1:string,input2:string):string;functioncombine(input1:number,input2:number):number;functioncombine(input1:any,input2:any):any{returninput1+input2;}console.log(combine("Hello, ","World!"));// 输出: Hello, World!console.log(combine(10,20));// 输出: 30 1...
function add(x: number, y: number): number { return x + y; } let myAdd = function (x: number, y: number): number { return x + y; }; 2.1.2. Writing the function type A function’s type has the same two parts: the type of the arguments and the return type. When writing ou...
function add(x: number, y: number): number { return x + y; } let myAdd = function(x: number, y: number): number { return x + y; }; 我们可以给每个参数添加类型之后再为函数本身添加返回值类型。 TypeScript能够根据返回语句自动推断出返回值类型,因此我们通常省略它。
当设置 noImplicitAny: true functionfn(s){ // 报错: Parameter's'implicitly has an'any'type. console.log(s.subtr(3)); } 当设置noImplicitAny: false 就不会报上述错误。 noImplicitOverride(No Implicit Override) noImplicitOverride是TypeScript 4.3版本引入的一个编译选项。这个选项的作用是当类中的...
3 function pickCard(x: {suit: string; card: number; }[]): number; 4 function pickCard(x: number): {suit: string; card: number; }; 5 function pickCard(x:any): any { 6 // Check to see if we're working with an object/array ...
1let suits = ["hearts", "spades", "clubs", "diamonds"];23functionpickCard(x: {suit: string; card: number; }[]): number;4functionpickCard(x: number): {suit: string; card: number; };5functionpickCard(x:any): any {6//Check to see if we're working with an object/array7//if...
set(Arr, '小海') // console.log(map.get(Arr)); // 取值 function args() { console.log(arguments) // 伪数组 } const each = (value: any) => { let It = value[Symbol.iterator]() // 获取迭代器 let next:any = {done: false} while(!next.done) { next = It.next() if(!next...
function fn(x: string): void; function fn() { // ... } // Expected to be able to call with zero arguments fn(); //Expected 1 arguments, but got 0.Expected 1 arguments, but got 0. 同样,用于编写函数体的签名不能是外部的 “seen”。 从外部看不到实现的签名。 在编写重载函数时,你...
联系我们:有道技术团队助手:ydtech01 / 邮箱:ydtech@rd.netease.com本文是《玩转TypeScript工具类型》系列的第二篇,包含了如下几部分内容:必读:extends...