[英]How to insert a new key value to the existing JSON object array?
I have the below JSON array,我有以下 JSON 数组,
const data = [{id:1,name:'a'},{id:2,name:'b'},{id:3,name:'c'}]
and I have to insert one more property to each object, and expected result would be like this.并且我必须向每个对象再插入一个属性,预期结果将是这样的。
const data = [{id:1,name:'a',selected:false},{id:2,name:'b',selected:false},{id:3,name:'c',selected:false}]
I'm trying to achieve this javascript only.我只想实现这个javascript。
Please help me on this.请帮我解决这个问题。
The question did not reach the standards of Stackoverflow, but from your comments, I believe that you are seriously looking for a solution's than your reputation.这个问题没有达到 Stackoverflow 的标准,但是从您的评论中,我相信您正在认真寻找解决方案而不是您的声誉。
The answer is kind of simple old-school method, please refer and give a try.答案是一种简单的老派方法,请参考并尝试。 Thanks.谢谢。
const data = [{id:1,name:'a',selected:false},{id:2,name:'b',selected:false},{id:3,name:'c',selected:false}] data.forEach((element,index) => { element["selected"] = false, element["test"]=index+1 // any key-value pairs }); console.log(data)
A simple loop is all you need.一个简单的循环就是你所需要的。
for (let item of data) {
item.selected = false;
}
On each iteration of this loop, item
becomes the next item from the iterated object ( data
, in this case).在此循环的每次迭代中, item
成为迭代对象(在本例中为data
)的下一个项目。 Since the array still references these same objects, you can modify item
, and this modification also appears on the item in data
... again because it is the same object.由于数组仍然引用这些相同的对象,因此您可以修改item
,并且此修改也出现在data
的 item 上...再次因为它是同一个对象。
var data = [{id:1,name:'a'},{id:2,name:'b'},{id:3,name:'c'}];
for (i = 0; i < data.length; i++) {
// add the addition property using dot notation
data[i].selected = 'false';
}
// output to console the updated data
console.log(data);
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