Question

无论尝试什么，我都会不断收到未定义的错误。当console.log(this.EmployeeDetails.gallery);，gallery[i].path确实有值时，我确实有值，但是我的浏览器控制台不断提示它，我尝试了各种方法，例如首先设置空字符串，在另一个函数中移动for循环，等待它，一切都不起作用。

await this.employeeService.getEmployeeDetails(this.Employeeuuid).subscribe((res) => {
  this.EmployeeDetails = res as Employee[];
  this.data.serviceprice = this.EmployeeDetails.serviceprice;
  this.setEmployees();
  console.log(this.EmployeeDetails.gallery);

  for (let i = 0; i <= this.EmployeeDetails.gallery.length; i++) {
    this.photossrc = this.EmployeeDetails.gallery[i].path;
    const src = this.photossrc;
    const caption = 'Image ' + i + ' caption here';
    const thumb = this.EmployeeDetails.gallery[i].path;
    const album = {
      src: src,
      caption: caption,
      thumb: thumb
    };
    this.albums.push(album);
  }
});

错误TypeError：无法读取未定义的属性“路径” 在EmployeeEditComponent.push ../ src / app / pages / employee / employee-edit / employee-edit.component.ts.EmployeeEditComponent.loadPhotosAndVideos中（employee-edit.component.ts：201）在SafeSubscriber._next（employee-edit.component.ts：96）在SafeSubscriber.push ../ node_modules / rxjs / _esm5 / internal / Subscriber.js.SafeSubscriber .__ tryOrUnsub（Subscriber.js：196）在SafeSubscriber.push ../ node_modules / rxjs / _esm5 / internal / Subscriber.js.SafeSubscriber.next （Subscriber.js：134）在Subscriber.push ../ node_modules / rxjs / _esm5 / internal / Subscriber.js.Subscriber._next （Subscriber.js：77）在Subscriber.push ../ node_modules / rxjs / _esm5 / internal / Subscriber.js.Subscriber.next （Subscriber.js：54）在MapSubscriber.push ../ node_modules / rxjs / _esm5 / internal / operators / map.js.MapSubscriber._next中（map.js：41）在MapSubscriber.push ../ node_modules / rxjs / _esm5 / internal / Subscriber.js.Subscriber.next中（Subscriber.js：54）在FilterSubscriber.push ../ node_modules / rxjs / _esm5 / internal / operators / filter.js.FilterSubscriber._next下（filter.js：38）在FilterSubscriber.push ../ node_modules / rxjs / _esm5 / internal / Subscriber.js.Subscriber.next中（Subscriber.js：54）

Answer 1

循环长度不应该小于或等于刚刚变短的长度，例如：

 for (let i = 0; i < this.EmployeeDetails.gallery.length; i++) {
     ...
    }

错误TypeError：无论我尝试过什么，都无法读取未定义的属性“路径”

1 个答案: