Question

我是Javascript的新手。我有一个对象，我需要将它与变量进行比较，然后如果满足条件，我会做一些事情。如何才能访问我需要的字段？

我接受了这个变量：$scope.acceptedProjects['hash'][key]['title']

这是我的代码：

$scope.overlappingDates = overlappingDates;
$scope.acceptedProjects = invitationService.acceptedProjects;

for(var value in $scope.overlappingDates) {
    for(var key in $scope.acceptedProjects['hash']) {
        console.log($scope.overlappingDates);
        console.log($scope.acceptedProjects['hash'][key]['title']);
    }
}
return;

如果我尝试$scope.overlappingDates[value]，它会返回我只需要切片或做一些事情来将这个庞大的名称转换为var。

Answer 1

从我看到的浏览器输出中，overlap1是包含内部对象的数组。这就是如何获取对象值

for (var i = 0; i < overlap1.length; i++;){ //iterate over all objects inside array
    var el = overlap1[i];
    //get variables of object
    var projectDateId = el.project_date_id// or el["project_date_id"];
    var projectsProjectId = el.projects_project_id// or el["projects_project_id"];
    //do something with this variables
}

Answer 2

不确定我是否有你想要达到的目标。但是一步一步地看一下这个抽象的例子，并了解这里发生了什么。我希望这可以帮助您更熟悉访问对象属性和数组项：

var data = {
    prop1: [
        {meaning_property: 1},
        {meaning_property: 2},
        {meaning_property: 3}
    ],
    prop2: [
        {meaning_property: 4},
        {meaning_property: 5},
        {meaning_property: 6}
    ]
};

var found_field_name = null;
var found_item_index = -1;

var looking_for_value = 5;

// loop through data's fields
for (var prop in data) {
    // access the value of object's field prop1, prop2 etc...
    var arr = data[prop];
    // loop through array
    for (var i = 0; i < arr.length; i++) {
        var item = arr[i];
        // item property value meets the condition?
        if (item.meaning_property === looking_for_value) {
            // remember field name for array
            found_field_name = prop;
            // remember item index in array
            found_item_index = i;
            // break the cycle here, we've found what we need
            break;
        }

        /**
         * item.meaning_property you can also access in different ways
         * arr[i].meaning_property
         * data[prop][i].meaning_property
         * data["prop1"][0].meaning_property
         * data.prop1[0].meaning_property
         */
    }
}

// if we found something during previos loop
if (found_field_name !== null) {
    // access the corresponding array
    var arr = data[found_field_name];
    // access the corresponding item
    var item = arr[found_item_index];
    console.log("Item found", found_field_name, found_item_index, arr, item);
}
else {
    console.log("No items met the criteria");
}

尝试使用此代码，我相信，您最终会找到解决问题的方法。

如何将对象切片为变量

2 个答案: