如何将数组值迭代到另一个数组的所有元素

Question

我有 2 个数组：汽车和自行车。 我想将汽车数组的每个元素与自行车数组的所有其他元素进行比较，如果两者相等，则警报为真，否则为假。

$scope.getComparison = function() {
$scope.bikes = ["1", "3", "3", "2", "6", "55", "45", "36", "18"];
angular.forEach($scope.bikes, function(value, key) {
    $scope.p_Id = value.bikes;
    $scope.cars = ["1", "2", "3", "4", "54", "55", "56", "56", "58"];
    angular.forEach($scope.cars, function(value, key) {
        $scope.b_Id = value.cars;
        if ($scope.p_Id == $scope.b_Id) {
            alert(b_Id + "=" + p_Id + "=" + "true");
        } else {
            alert(b_Id + "=" + p_Id + "=" + "false");
        }
    });
  });
};

我哪里错了？我需要帮助。

Answer 1

不工作！

var _firstArray = ["1", "3", "3", "2", "6", "55", "45", "36", "18"];
var _secondArray=["1", "2", "3", "4", "54", "55", "56", "56", "58"];

var areEqual = true;

_firstArray.forEach(function(item) {
    if (!(item in _secondArray)) {
        areEqual = false;
    }
});
console.log(areEqual);

编辑：我对“in”运算符的理解是错误的。它只检查给定对象的属性。

"45" in _firstArray 将产生false，但0 in _firstArray 将产生true，因为0 是该数组的属性，'length' in _firstArray 也将产生true。这是一个可行的解决方案：

var _firstArray = ["1", "3", "3", "2", "6", "55", "45", "36", "18"];
var _secondArray=["1", "2", "3", "4", "54", "55", "56", "56", "58"];

_firstArray.forEach(function(item1) {
    _secondArray.forEach(function (item2) {
        if (item1 === item2) {
            console.log(item1 + '=' + item2 + '=' + 'true');
        } else {
            console.log(item1 + '=' + item2 + '=' + 'false');
        }
    });
});

Answer 2

试试这个：

   $scope.bikes = ["1", "3", "3", "2", "6", "55", "45", "36", "18"];
   $scope.cars = ["1", "2", "3", "4", "54", "55", "56", "56", "58"];
   angular.forEach($scope.bikes, function(bike) {
      angular.forEach($scope.cars, function(car) {
        if (bike == car) {
          alert(bike + "=" + car + "=" + "true");
         } else {
             alert(bike  + "=" + car+ "=" + "false");
           }
     });
   });

Answer 3

您可以使用forEach & indexOf 数组方法来查找匹配项

var _firstArray = ["1", "3", "3", "2", "6", "55", "45", "36", "18"];
var _secondArray=["1", "2", "3", "4", "54", "55", "56", "56", "58"];
_firstArray.forEach(function(item){
  if (_secondArray.indexOf(item) !==-1){
     console.log(item)  
  }
  else{
  console.log("not matched");
  }
})

注意：您可以在代码中使用相同的数组方法

查看jsfiddle

Answer 4

希望这就是你要找的东西

jsFiddle 链接 - https://jsfiddle.net/U3pVM/25016/ 。用控制台替换警报

$scope.getComparison = function() {
$scope.bikes = ["1", "3", "3", "2", "6", "55", "45", "36", "18"];
angular.forEach($scope.bikes, function(value, key) {
    $scope.p_Id = value;
    $scope.cars = ["1", "2", "3", "4", "54", "55", "56", "56", "58"];
    angular.forEach($scope.cars, function(value, key) {
        $scope.b_Id = value;
        if ($scope.p_Id == $scope.b_Id) {
            alert($scope.b_Id + "=" + $scope.p_Id + "=" + "true");
        } else {
            alert($scope.b_Id + "=" + $scope.p_Id + "=" + "false");
        }
    });
});
};

Answer 5

forEach() 方法的

value 参数已经代表了数组中的自行车，汽车也是如此： 您可以像这样更改代码：

$scope.getComparison = function() {
$scope.bikes = ["1", "3", "3", "2", "6", "55", "45", "36", "18"];
angular.forEach($scope.bikes, function(value, key) {
    $scope.p_Id = value;
    $scope.cars = ["1", "2", "3", "4", "54", "55", "56", "56", "58"];
    angular.forEach($scope.cars, function(value, key) {
        $scope.b_Id = value;
        if ($scope.p_Id == $scope.b_Id) {
            alert(b_Id + "=" + p_Id + "=" + "true");
        } else {
            alert(b_Id + "=" + p_Id + "=" + "false");
        }
    });
});
};

它应该可以工作。

您还可以嵌套forEach() 方法，如下所示：

 $scope.getComparison = function() {
    $scope.bikes = ["1", "3", "3", "2", "6", "55", "45", "36", "18"];
    $scope.cars = ["1", "2", "3", "4", "54", "55", "56", "56", "58"];
    angular.forEach($scope.bikes, function(bikeValue, bikeKey) {
        angular.forEach($scope.cars, function(carValue, carKey) { 
            if (bikeValue == carValue) {
                alert(bikeValue + "=" + carValue + "=" + "true");
            } else {
                alert(bikeValue + "=" + carValue + "=" + "false");
            }
        });
    });
    };

这种方式直接比较它们而不将值保存到$scope。

Answer 6

比较 1 个数组的 每个 元素与另一个数组的 每个 元素？

2 每个的意思是使用2个循环就是这样。

Answer 7

你的代码有问题，试试下面的代码应该可以正常工作：

$scope.getComparison = function() {
                        $scope.bikes = ["1", "3", "3", "2", "6", "55", "45", "36", "18"];
                        angular.forEach($scope.bikes, function(value, key) {
                            $scope.p_Id = value;
                            $scope.cars = ["1", "2", "3", "4", "54", "55", "56", "56", "58"];
                            angular.forEach($scope.cars, function(value, key) {
                                $scope.b_Id = value;
                                if ($scope.p_Id == $scope.b_Id) {
                                    alert($scope.b_Id + "=" + $scope.p_Id + "=" + "true");
                                } else {
                                    alert($scope.b_Id + "=" + $scope.p_Id + "=" + "false");
                                }
                            });
                        });
                    };