Node.js 向现有JSON文件添加对象

js代码的目标是能够读取、添加和删除JSON对象。我的JSON代码如下所示：

{
    "first": [
    {
        "id": 1112313,
        "price": 11     
    },
    {
        "id": 11123122413,
        "price": 112    
    }
    ],
    "second": [
    {
        "id": 4121312,
        "price": 55 
    }
    ],
    "third": [
    {
        "id": 87845,
        "price": 444    
    }
    ]
}

//Reading JSON file
var fs = require('fs');
var object = JSON.parse(fs.readFileSync('./jsonFile.JSON', 'utf8'));
console.log(object.first[0].price);

//Deleting 
delete object.first[0].price

//Adding a new object
object.first[] = {"id":11245, "price": 123};

//Writing results to JSON file
fs.writeFileSync('jsonFile.json', object);

//Reading JSON file
var fs = require('fs');
var object = JSON.parse(fs.readFileSync('./jsonFile.JSON', 'utf8'));
console.log(object.first[0].price);

//Deleting 
delete object.first[0].price

//Adding a new object
object.first = [{ id: 11245, price: 123 }];

//Writing results to JSON file
fs.writeFileSync('jsonFile.json', JSON.stringify(object));

我找到了阅读部分，但删除和添加新对象部分对我不起作用。我只在JSON文件中写入[Object]。到目前为止，我的代码如下所示：

{
    "first": [
    {
        "id": 1112313,
        "price": 11     
    },
    {
        "id": 11123122413,
        "price": 112    
    }
    ],
    "second": [
    {
        "id": 4121312,
        "price": 55 
    }
    ],
    "third": [
    {
        "id": 87845,
        "price": 444    
    }
    ]
}

//Reading JSON file
var fs = require('fs');
var object = JSON.parse(fs.readFileSync('./jsonFile.JSON', 'utf8'));
console.log(object.first[0].price);

//Deleting 
delete object.first[0].price

//Adding a new object
object.first[] = {"id":11245, "price": 123};

//Writing results to JSON file
fs.writeFileSync('jsonFile.json', object);

//Reading JSON file
var fs = require('fs');
var object = JSON.parse(fs.readFileSync('./jsonFile.JSON', 'utf8'));
console.log(object.first[0].price);

//Deleting 
delete object.first[0].price

//Adding a new object
object.first = [{ id: 11245, price: 123 }];

//Writing results to JSON file
fs.writeFileSync('jsonFile.json', JSON.stringify(object));

---

有什么办法让它工作吗？

你可能会想要这样的东西：

{
    "first": [
    {
        "id": 1112313,
        "price": 11     
    },
    {
        "id": 11123122413,
        "price": 112    
    }
    ],
    "second": [
    {
        "id": 4121312,
        "price": 55 
    }
    ],
    "third": [
    {
        "id": 87845,
        "price": 444    
    }
    ]
}

//Reading JSON file
var fs = require('fs');
var object = JSON.parse(fs.readFileSync('./jsonFile.JSON', 'utf8'));
console.log(object.first[0].price);

//Deleting 
delete object.first[0].price

//Adding a new object
object.first[] = {"id":11245, "price": 123};

//Writing results to JSON file
fs.writeFileSync('jsonFile.json', object);

//Reading JSON file
var fs = require('fs');
var object = JSON.parse(fs.readFileSync('./jsonFile.JSON', 'utf8'));
console.log(object.first[0].price);

//Deleting 
delete object.first[0].price

//Adding a new object
object.first = [{ id: 11245, price: 123 }];

//Writing results to JSON file
fs.writeFileSync('jsonFile.json', JSON.stringify(object));

JSON.stringify

很重要，因为否则会得到可怕的

[object]

---

还要注意如何将

object.first

设置为此处的新数组。

fs.writeFileSync（'jsonFile.json'，json.stringify（object，null，2））嗯，是的，这是可行的，但有一件事，删除部分似乎抹去了整个第一个对象。有没有办法只擦一个而不擦另一个呢？是的，像这样：
删除对象。首先[0][“price”]
-注意这里如何使用方括号符号。当添加对象时，您也可以做相反的操作：
object.first[0][“price”]=123
好吧，不管怎样，还是有点相反。哦，我剩下的是{“first”：[null，{“id”：11123122413，“price”：112}，{“I…”讨厌的null。摆脱它的简单方法？您肯定在使用
删除对象。first[0][“price”
而不仅仅是
删除对象。first[0]
？