当TypeScript 第一次引入索引符号时,你只能使用“方括号包括的”元素获取语法(如person["name"])来获取它们声明的属性。 代码语言:javascript 代码运行次数:0 运行 AI代码解释 interfaceSomeType{/** This is an index signature. */[propName:string]:any;}functiondoS
exportclassPerson{ firstName: string; lastName: string;constructor(fn: string, ln: string) {this.firstName = fn;this.lastName = ln; } greet() : string {returnthis.fullName +" says hello!"; }getfullName() : string {returnthis.firstName +" "+this.lastNam...
type User={firstName:string;lastName:string;};functiongetUserFullName(user:User,prefix?:string){return`${prefix??''}${user.firstName}${user.lastName}`;}constuser:User={firstName:"Jon",lastName:"Doe"};constuserFullName=getUserFullName(user);constmrUserFullName=getUserFullName(user,'Mr....
ArkTS classX{publicname:string=''}letx: X = {name:'x'};console.log(x.name);lety = ['a','b','c'];console.log(y[2]);// 在需要通过非标识符(即不同类型的key)获取数据的场景中,使用Map< Object, some_type >。letz =newMap<Object,string>(); z.set('name','1'); z.set(2,'...
Property 'name' does not exist on type 'unknown'. Property 'stack' does not exist on type 'unknown'. To get around this, you can specifically add runtime checks to ensure that the thrown type matches your expected type. Otherwise, you can just use a type assertion, add an explicit :...
(Button:constructor) | the class constructor}** Sometimes a name has special characters that are not a legal TypeScript identifier:** {@link restProtocol.IServerResponse."first-name" | the first name property}** Here is a fairly elaborate example where the function name is an ECMAScript 6...
You can pass aditional transforms to the compiler pipeline. We aligned with the interface ofawesome-typescript-loader. You can specify transforms by setting thegetCustomTransformersoption. The option expects a string, pointing at a module that exposes the transforms, or a function that returns the...
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const formatMetadataKey = Symbol("format"); function format(formatString: string) { return Reflect.metadata(formatMetadataKey, formatString); } function getFormat(target: any, propertyKey: string) { return Reflect.getMetadata(formatMetadataKey, target, propertyKey); } 这里的format可以作为装饰器函...
The problem is that you’ve spelled the same property two different ways, and TypeScript doesn’t know which one is right. It can guess, but it may not always be correct. The solution is to clarify your intent by explicitly declaring the type ofstates: ...