Question

我有两个数组。元素相同，但值可以不同。我需要查看它们匹配的两个元素是.fromSourceId和.toSourceId

我要比较的两个数组是userCompareData和userData。元素的数量会发生变化。最后，我看到userComparedata是否在userData中匹配，如果它不存在则添加到createChange

因此，如果userCompareData.toSourceId = userData.toSourceId和userCompareData.fromSourceId = userData.fromSourceId，我不需要将匹配的userCompareData添加到createChange方法。

addPermissionsForCopy = function(){

    for (var i = 0; i < $scope.userData.length; i++) {
        isFound = false;
        for (var j = 0; j < $scope.userCompareData.length; j++) {

            if ($scope.userCompareData[j].fromSourceID === $scope.userData[i].fromSourceID) {
                if ($scope.userCompareData[j].toSourceID === $scope.userData[i].toSourceID) {
                    isFound = true;
                }
            }
        }

        if (isFound === false) {
            $scope.createChange($scope.userCompareData[i].fromSourceID, $scope.userCompareData[i].toSourceID, true, $scope.selectedUserName);
        }
    }
};

这并不是很正确，因为每次调用此方法时，数据中的元素数量都会不同。 userData可能包含6个项目，然后接下来的2个与userCompareData相同。

Answer 1

反转这些循环，以便您可以保存未找到的索引：

addPermissionsForCopy = function(){

    for (var i = 0; i < $scope.userCompareData.length; i++) {
        isFound = false;
        for (var j = 0; j < $scope.userData.length; j++) {

            if ($scope.userCompareData[i].fromSourceID === $scope.userData[j].fromSourceID) {
                if ($scope.userCompareData[i].toSourceID === $scope.userData[j].toSourceID) {
                    isFound = true;
                }
            }
        }

        if (isFound === false) {
            $scope.createChange($scope.userCompareData[i].fromSourceID, $scope.userCompareData[i].toSourceID, true, $scope.selectedUserName);
        }
    }
};

Answer 2

Try angular.forEach():
var isFound=false;
angular.forEach(userCompareData, function(userComVal){
   angular.forEach(userData, function(userDataVal){
      if(userComval==userDataVal){
        //do what you want on true
        isFound=true;
      }else{
          isFound=false;
      }
   });
   if(isFound==false){
    //do what you want
    $scope.createChange($scope.userCompareData[i].fromSourceID, $scope.userCompareData[i].toSourceID, true, $scope.selectedUserName);
  }
});

从一个数组中查找另一个数组中的项目

2 个答案: