Question

我的问题是只保留对象数组中的特定字段值，在我的例子中，它是FirstName，LastName，PhoneNumber，Department，EmailId。对象数组$ scope.devices中的单个对象有很多字段，但我想保留所有对象的上述字段值。

 // Angularjs part ,devices is the objecctlist    
    var deviceArray = []; 
           for(var entry in  $scope.devices)  {
           deviceArray.push({FirstName: entry.FirstName,
                             LastName:  entry.LastName,
                             PhoneNumber: entry.PhoneNumber,
                             EmailId : entry.EmailId,
                             Department : entry.Department,
                             });`
           };
           $log.debug('deviceArray :', deviceArray) //deviceArray : []

Answer 1

尝试：

var deviceArray = [], fields = "FirstName,LastName,PhoneNumber,Department,EmailId";

angular.forEach($scope.devices, function(item){
    var temp = {};
    angular.forEach(fields.split(/[, ]+/), function(key){
        temp[key] = item[key]
    });
    deviceArray.push(temp)
});

console.log(deviceArray)

Answer 2

如果您正在使用角度，则最好使用角度forEach

您可以使用angular forEach

以下列方式执行此操作

var deviceArray = [];

angular.forEach($scope.devices,function(entry,key){     

      deviceArray.push({    
                            FirstName: entry.FirstName,
                            LastName:  entry.LastName,
                            PhoneNumber: entry.PhoneNumber,
                            EmailId : entry.EmailId,
                            Department : entry.Department,
                      }); 

    })

中的

将提供索引编号，而不是Object.Using该索引，您必须访问该数组中的实际对象。

var deviceArray = []; for(var entry in $scope.devices){ deviceArray.push({ FirstName: $scope.devices[entry].FirstName, LastName: $scope.devices[entry].LastName, PhoneNumber: $scope.devices[entry].PhoneNumber, EmailId : $scope.devices[entry].EmailId, Department : $scope.devices[entry].Department, }); }

Answer 3

在表单for (var entry in $scope.devices)中，您将数组的键作为对象循环，因此entry为0,1，等等。

您应该对数组使用for (var i = 0; i < ...)循环：

 var deviceArray = [];
 for (var i = 0; i < $scope.devices.length; i++) {
     var entry = $scope.devices[i];
     deviceArray.push({
         FirstName: entry.FirstName,
         LastName: entry.LastName,
         PhoneNumber: entry.PhoneNumber,
         EmailId: entry.EmailId,
         Department: entry.Department,
     });
 };

但在这种情况下，使用Array.prototype.map:

是最佳选择

var deviceArray = $scope.devices.map(function(entry) {
    return {
         FirstName: entry.FirstName,
         LastName: entry.LastName,
         PhoneNumber: entry.PhoneNumber,
         EmailId: entry.EmailId,
         Department: entry.Department,
     };
});

如何在数组中推送对象列表的特定字段

3 个答案: