getStepList(): Observable<JSON> {
this.headers = new Headers();
this.headers.append('Content-Type', 'application/json; charset=utf-8');
let options = new RequestOptions({
method: RequestMethod.Post,
url: "FeedbackMaster.aspx/getStepList",
headers: this.headers,
body:{log:this.login}
});
return this._http.request(new Request(options)).retry(2)
.map((response: Response)=>this.extractData(response))
.do(data => {this.temp=data, console.log('getStepList:'+ JSON.stringify(JSON.parse(this.temp.d)))})
.catch(this.handleError);
}
extractData(res: Response) {
let body = res.json();
return body || { }; //<--- not wrapped with data
}
handleError(error: any) {
console.error('An error occurred', error);
return Promise.reject(error.message || error);
}
................................................ ..................................................... ……
错误
[ts]
Type 'Observable<void>' is not assignable to type 'Observable<JSON>'.
Type 'void' is not assignable to type 'JSON'.
我的代码有什么问题？
最佳答案
.map()需要返回一些东西，例如:
.map((response: Response) => { this.extractData(response); return response.json(); })
return response.json()产量 Observable<JSON> .不从 .map() 返回任何内容它变成Observable<void> .
关于angular - 类型 'Observable<void>' 不可分配给类型 'Observable<JSON>'，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/42289772/