typescript TS2683 (TS) 'this' 隐式具有类型 'any'，因为它没有类型注释
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TS2683 (TS) 'this' implicitly has type 'any' because it does not have a type annotation
提问by Hemant
I'm facing this problem with TypeScript file and would like to know how to fix this.
我正面临 TypeScript 文件的这个问题，想知道如何解决这个问题。
For now I have suppressed this typescript exception but would like to learn how to address this. The following is my code:
现在我已经抑制了这个打字稿异常，但想学习如何解决这个问题。以下是我的代码：
export class BaseResult {
isSuccessful: boolean;
totalRecords: number;
successMessage: string;
reasonForFailure: string;
lastExecutedDateTime: Date;
}
export class Result<T> extends BaseResult {
data: T;
}
export class CollectionResult<T> extends BaseResult {
data: T[];
}
export class PagedCollectionResult<T> extends CollectionResult<T> {
pageNumber: number;
pageSize: number;
filter: string;
pages = function () {
return (this.totalRecords <= 0 || this.pageSize <= 0) ? 0 : Math.ceil(this.totalRecords / this.pageSize);//<--All the **this** keyword shows the error
}
}
回答by Eric King
As some of the comments indicated, your thisreference is not typed because you are using the function () {}syntax to define your function. The thisobject inside such a function will inherently be of type any, because thiswill be the caller of the function (unknowable at design-time).
正如一些评论所指出的，您的this引用没有键入，因为您正在使用function () {}语法来定义您的函数。this此类函数内的对象本质上是 类型any，因为this它将是函数的调用者（在设计时不可知）。
If you change your syntax to an arrow function, like
如果您将语法更改为箭头函数，例如
pages = () => {
or simply omit the function keyword and arrow altogether, like
或者干脆完全省略 function 关键字和箭头，例如
pages() {
then the thisobject inside the function will reference the class instance thisinstead of type any.
那么this函数内的对象将引用类实例this而不是 type any。
See the TypeScript handbookfor more explanation.
有关更多解释，请参阅TypeScript 手册。
回答by BOPOHOB
Use explicit thisannotation: pages = function(this: BaseResult) {
使用显式this注释：pages = function(this: BaseResult) {
