在数组中的特定索引处推送布尔值

Question

我想在数组中的特定索引处推送布尔值。每当我运行代码时，我都会收到此错误，错误类型错误：无法读取未定义的属性"push">

这是我的代码：

              var check_ins = [];
          for (var i = 0; i < this.employees.length; i++) {
            // let check = check_ins[i];
            if (check_ins[i] === true) {
              let alert = this.alertCtrl.create({
                title: 'Sorry,',
                subTitle: 'ur already checked in',
                buttons: ['OK']
              });
              alert.present();
              break;
            } else if (check_ins[i] === false || check_ins[i] === undefined) {
              let checkInTime = new TimeInModel(in_timing.date, emp_id, in_timing.time_in);
              this.employeesService.pushTimeIn(checkInTime)
                .subscribe(checkInTime => {
                },
                error => this.errorMessage = <any>error);
              console.log("Successfully checked-in!");
              check_ins[i].push(true);
              break;
            }

可能是什么问题？使用数组实现相同输出的另一种选择吗？

Answer 1

你不需要将值true推入check_ins[i]，你可以设置它： check_ins[i] = true或推 true 到数组： check_ins.push(true)

Answer 2

使用 push 时，推送的值将作为新元素添加到数组中。我建议您执行以下操作：

   var check_ins = [];
      for (var i = 0; i < this.employees.length; i++) {
        // let check = check_ins[i];
        if (check_ins[i] === true) {
          let alert = this.alertCtrl.create({
            title: 'Sorry,',
            subTitle: 'ur already checked in',
            buttons: ['OK']
          });
          alert.present();
          break;
        } else if (check_ins[i] === false || check_ins[i] === undefined) {
          let checkInTime = new TimeInModel(in_timing.date, emp_id, in_timing.time_in, true);
          this.employeesService.pushTimeIn(checkInTime)
            .subscribe(checkInTime => {
            },
            error => this.errorMessage = <any>error);
          console.log("Successfully checked-in!");
          check_ins[i]=true;
          break;
        }