Question

我得到了错误。

无法读取未定义的属性“ toDate”。没有apply(DF, 1, function(x) { temp = Events[Events$location %in% x["location"] x %>% mutate(overlap = pmax(pmin(temp$end, end) - pmax(temp$start, start) + 1,0)) })

我得到

时间戳（秒= 1545109200，纳秒= 0）

我引用了此Angular 6 firebase snapshot returns undefined

不过，将时间戳记转换为可读的日期字符串并不特定。预期的输出将是2018年12月6日。

schedule-list.component.html

(Error in UseMethod("mutate_") : 
  no applicable method for 'mutate_' applied to an object of class "character")

schedule.model.ts

toDate() | Date

Pipe.ts

<div class="container ">
    <div class="row">
      <div *ngFor="let appoint of list" class="col-md-8 myCenter mt-2"> 
        <!-- the bottom code should work if items within list exist. -->
        <div class="card">
          <div class="card-header">
              Title: {{appoint.name}}

          </div>
          <div class="card-body">
            <p>{{appoint.appointment_date.toDate() | date}}</p>
          </div>
      </div>
    </div>
  </div>
</div>

Schedule-list.component.ts

export class Schedule {
    name:string;
    appointment_date:string;
}

Answer 1

您必须将时间戳乘以1000，我已经遇到了相同的问题；

尝试一下：

<p>{{ appoint.appointment_date.seconds * 1000 | date:'dd:MM:yyyy hh:mm:ss' }}</p>

Answer 2

因为您有第二个时间戳，所以可以执行以下操作将其设置为日期：

ngOnInit() {
    this.service.getAppointments().subscribe(actionArray =>{
      this.list = actionArray.map(item =>{
        return{
          ...item.payload.doc.data()
        } as Schedule;
      })
      for(let i = 0; i < this.list.length; i++){
        console.log(this.list[i].appointment_date); // to see if the data is undefined!
        this.list[i].appointment_date = new Date(new Date(0).setUTCSeconds(this.list[i].appointment_date.seconds));
      }
    });
  }
));

angular firebase类型“字符串”不能分配给类型“日期”

2 个答案: