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。每当我跑的代码，我得到这个错误，错误类型错误：未定义

无法读取属性“推”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; 
      } 

可能是什么问题呢？是否有另一种方法来使用数组来实现相同的输出？

Answer 1

你并不需要的价值推到truecheck_ins[i]，你可以将其设置：check_ins[i] = true或推真到了数组：check_ins.push(true)

Answer 2

当您使用推，推入值被添加作为新元素到阵列。我建议你做下面的代替：

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; 
     }