离子性：未捕获（承诺）：TypeError：无法读取未定义的属性“ length”

Question

This is my typescript code

export class FailedPage {

  failedjobs: Array<any> = [];

  constructor(public navCtrl: NavController, 
              public navParams: NavParams, public jobfailList: JobActionsProvider) {
  }

  ionViewDidLoad() {
    console.log('FailedPage');
    // getting jobs from job-actions file and displaying
    this.jobfailList.getfailedjobList().then((data) => {
      console.log('displaying failed job list');
      for (let values of data) {
        this.failedjobs.push(values);
      }
    });
  }

}

I'm facing error as

Uncaught (in promise): TypeError: Cannot read property 'length' of undefined TypeError: Cannot read property 'length' of undefined at failed.ts:24

Here 24 line is for (let values of data) How can I fix this?

Answer 1

api的响应可以是data.data，具体取决于您的后端