如何在Javascript中创建对象内的数组列表
如何在Javascript中创建对象内的数组列表
我从数据库中得到的结果集如下：
{
"scrapped_name": [
"harry mccracken"
],
"publications": [
{
"_id": "5d3021a6eedfed29a7b5ae75",
"name": "Fast Company"
},
{
"_id": "5d3021a6eedfed1728b5ae7c",
"name": null
}
],
"language": [],
"location": [],
"_id": "5d3021a6eedfed37d3b5ae88",
"name": "harry mccracken",
"createdAt": "2019-07-18T07:37:10.626Z",
"updatedAt": "2019-07-18T07:37:10.626Z",
"social_media": []
}
1）我需要对结果数据集执行一些操作，然后需要手动使结果集与上述相同。在制作对象内部的Publication数组时，我遇到了问题。
2）有人可以帮我在结果集中添加新的键值吗？就像我从数据库查询中获得的上述结果一样，现在我想推入新的键值：
publisher : true
所以我在第二个问题中想要的结果数组是：
{
"scrapped_name": [
"harry mccracken"
],
"publications": [
{
"_id": "5d3021a6eedfed29a7b5ae75",
"is_followed": true,
"name": "Fast Company"
},
{
"_id": "5d3021a6eedfed1728b5ae7c",
"is_followed": false,
"name": null
}
],
"language": [],
"location": [],
"_id": "5d3021a6eedfed37d3b5ae88",
"name": "harry mccracken",
"createdAt": "2019-07-18T07:37:10.626Z",
"updatedAt": "2019-07-18T07:37:10.626Z",
"social_media": [],
"publisher": true
}
上述的"is_followed"将在运行时根据其他表动态计算。
问题原因：object.publisher = true;语句没有成功将值添加到对象中。
解决方法：检查代码后发现，问题可能是因为object对象中没有初始化publisher属性，所以无法直接给它赋值。解决方法是在对象初始化时，给对象添加一个空的publisher属性，然后再赋值为true。
以下是修改后的代码：
const object = {
scrapped_name: [
'harry mccracken',
],
publications: [
{
_id: '5d3021a6eedfed29a7b5ae75',
name: 'Fast Company',
},
{
_id: '5d3021a6eedfed1728b5ae7c',
name: null,
},
],
language: [],
location: [],
_id: '5d3021a6eedfed37d3b5ae88',
name: 'harry mccracken',
createdAt: '2019-07-18T07:37:10.626Z',
updatedAt: '2019-07-18T07:37:10.626Z',
social_media: [],
publisher: null, // Initialize publisher property with null
};
object.publisher = true; // Assign the value true to publisher property
// Customise `publications` array
if (object.publications && Array.isArray(object.publications)) {
object.publications.forEach((f) => {
const referenceObj = f;
let hasFollow = false;
if (f._id && f._id === '5d3021a6eedfed29a7b5ae75') {
hasFollow = true;
}
referenceObj.is_followed = hasFollow;
});
}
console.log(object);
请在chrome的控制台中尝试以下代码：
const obj = {};
obj.a = 'A';
console.log(obj);
输出结果将会是：
{a: "A"}
希望以上解决方法可以帮助您成功向对象中添加值。