Question

我想在函数失败时发送return Error，但是我不知道该怎么做...

Service.ts

 math(){
     try {
             .
             .
             .
       } catch (error) {
          return "error";
      }
    }

calc(url){
  num  = math();
  if (num !== "error"){
    return this.http.get<Object[]>(url);
  } else {
      return Error;
  }
}

component.ts

  this.service.calc(url).subscribe(
            data => {
                this.params = data;
            }, error => {
                this.errorServer = true;
                this.myMessage.message = "Error";
            }
        );

我在this.service.calc(url).subscribe中遇到错误，因为这不允许-> Return Error从calc

Answer 1

使用from collections import OrderedDict def ordered_to_regular_dict(d): if isinstance(d, OrderedDict) or isinstance(d, dict): d = {k: ordered_to_regular_dict(v) for k, v in d.items()} elif isinstance(d, list): d = [ordered_to_regular_dict(v) for v in d.items()] elif isinstance(d, tuple): d = (ordered_to_regular_dict(v) for v in d.items()) return d获得可观察到的回报。

throwError

返回错误。订阅Angular5

1 个答案: