AI代码解释 1const express=require('express')2const bodyParser=require('body-parser')3const cookieParser=require('cookie-parser')45const app=express()67app.use(bodyParser.json())8app.use(bodyParser.urlencoded({exte
* It handles any extra properties that we haven't declared as type 'any'. */[x:string]:any;}functionprocessOptions(opts:Options){// Notice we're *intentionally* accessing `excludes`, not `exclude`if(opts.excludes){console.error("The option `excludes` is not valid. Did you mean `exclud...
{// array - 数组// 创建数组letarray1:number[] = [1,2,3];letarray2:Array<number> = [1,2,3];letarray3:Array<any> = [1,"2",true];letarray4 = [1,2,3];letarray5 =Array.of(1,2,3);letarray6 =Array.from([1,2,3]);// 空位为 undefinedletarray7 =Array.from([1, ,3]...
console.log(array.values());//Object [Array Iterator] {} console.log(array.entries());//Object [Array Iterator] {} console.log(Array.from(array.keys()));//[ 0, 1, 2, 3 ] console.log(Array.from(array.values()));//[ 'a', 'b', 'c', 'd' ] console.log(Array.from(array....
,label:'放款计划'}]asconst// as const 来读到精确的值，而不是笼统的 string// 取到 array 里...
[] as T[K][]; keys.forEach(key=>{ arr.push(obj[key]); }) return arr; } let res = getValues(obj, ['name', 'gender']); console.log(res); // 索引访问操作符注意点 // 不会返回null/undefined/never类型 // "strictFunctionTypes": true, 与这个属性有关 interface TestInterface { ...
ReadonlyArray 是一个特殊的类型,描述了不应该被改变的数组。 function doStuff(values: ReadonlyArray<string>) { // 我们可以从 'values' 读数据... const copy = values.slice(); console.log(`第一个值是 ${values[0]}`); // ...但我们不能改变 'vulues' 的值。 values.push("hello!"); }...
An array in TypeScript can contain elements of different data types using a generic array type syntax, as shown below. Example: Multi Type Array Copy let values: (string | number)[] = ['Apple', 2, 'Orange', 3, 4, 'Banana']; // or let values: Array<string | number> = ['Apple...
typeStatus='not_started'|'progress'|'completed'|'failed';console.log(Object.values(Status));// ❌ “Status”仅表示类型,但在此处却作为值使用。 1. 2. 这时就会抛出一个错误,告诉我们不能将 Status 类型当做值来使用。 如果想要遍历这些值,可以使用枚举来实现: ...
typeNestedOmit<T,K>={[PinkeyofT]:T[P]extendsobject?NestedOmit<T[P],K>:T[P];}&{};functiondeepOmit<Textendsobject,Kextendsstring>(obj:T,keys:K[]):NestedOmit<OmitDeep<T,K>,K>{if(Array.isArray(obj)){returnobj.map((item)=>deepOmit(item,keys))asany;}if(typeofobj==='object'&&...