我正在尝试在打字稿中扩展Request
类,如下所示:
export class ApiRequest extends Request {
static userAgentHeader: string = '';
static xUserAgentHeader: string = '';
public body: string;
constructor(url: string, initialData?: any) {
super(url, initialData);
if (this.method !== 'GET') {
this.body = initialData._bodyText;
}
this.headers.set('User-Agent', ApiRequest.userAgentHeader);
this.headers.set('X-User-Agent', ApiRequest.xUserAgentHeader);
}
static setAgentHeader(userAgentHeader: string) {
ApiRequest.userAgentHeader = userAgentHeader;
}
static setXUserAgentHeader(xUserAgentHeader: string) {
ApiRequest.xUserAgentHeader = xUserAgentHeader;
}
}
但是,当转移到ES5时,我会得到遵循的代码:
import * as tslib_1 from "tslib";
var ApiRequest = /** @class */ (function (_super) {
tslib_1.__extends(ApiRequest, _super);
function ApiRequest(url, initialData) {
var _this = _super.call(this, url, initialData) || this;
if (_this.method !== 'GET') {
_this.body = initialData._bodyText;
}
_this.headers.set('User-Agent', ApiRequest.userAgentHeader);
_this.headers.set('X-User-Agent', ApiRequest.xUserAgentHeader);
return _this;
}
ApiRequest.setAgentHeader = function (userAgentHeader) {
ApiRequest.userAgentHeader = userAgentHeader;
};
ApiRequest.setXUserAgentHeader = function (xUserAgentHeader) {
ApiRequest.xUserAgentHeader = xUserAgentHeader;
};
ApiRequest.userAgentHeader = '';
ApiRequest.xUserAgentHeader = '';
return ApiRequest;
}(Request));
export { ApiRequest };
//# sourceMappingURL=ApiRequest.js.map
尝试通过调用new ApiRequest(url)
创建ApiRequest
对象时出现问题,Uncaught TypeError
带有以下消息:
untuark typeError:无法构造'请求':请使用"新"运算符,该DOM对象构造函数不能称为函数。 在esta(apirequest上的评估(apirequest.js:5(,:1:1(
看来,如果没有new
关键字,看来不得调用Request
,但是转纸代码仅在第5行(_super.call()
(上。
有没有办法以某种方式进行此操作?
最终起作用的解决方案是用类似类函数包装Request
:
export const RequestWrapper: RequestWrapper = function(url: string, initialData?: any) {
return new Request(url, initialData);
} as any;
export interface RequestWrapper extends Request {
(url: string, initialData?: any): Request;
new (url: string, initialData?: any): Request;
}
然后扩展RequestWrapper
而不是Request
:
export class ApiRequest extends RequestWrapper {
...
}