使用节点 js / javascript 在一个文件中存储 JSON 数据值

Question

let details = [
  {
    value: { tag: [] },
    details: {
      system: "pc",
      systemName: "Dell",
      ram: "4GB",
    },
    Others: {
      OS: "linux",
      harddisk: "125GB",
      Encrypted: "yes",
      password: "abc",
    },
  },
  {
    value: { tag: [] },
    details: {
      system: "pc",
      systemName: "Dell",
      ram: "8GB",
    },
    Others: {
      OS: "Windows",
      harddisk: "125GB",
      Encrypted: "yes",
      password: "xyz",
    },
  },
  {
    value: { tag: [] },
    details: {
      system: "laptop",
      systemName: "Lenovo",
      ram: "4GB",
    },
    Others: {
      OS: "linux",
      harddisk: "256GB",
      Encrypted: "no",
      password: null,
    },
  },
  {
    value: { tag: [] },
    details: {
      system: "pc",
      systemName: "Lenovo",
      ram: "8GB",
    },
    Others: {
      OS: "Ubuntu",
      harddisk: "125GB",
      Encrypted: "yes",
      password: "abc",
    },
  },
  {
    value: { tag: [] },
    details: {
      system: "laptop",
      systemName: "hp",
      ram: "4GB",
    },
    Others: {
      OS: "linux",
      harddisk: "125GB",
      Encrypted: "yes",
      password: "abc",
    },
  },
];

details.map((data) => {
  let folderPath = path.join(__dirname, data.details.systemName);
  fs.mkdir(folderPath, (err) => {
    if (err) throw err;
  });

  fs.writeFile(`${folderPath}/SystemConfig.json`, JSON.stringfy(data.Others, null, 4), (err) => {
    if (err) throw err;
    console.log("Data added Successfully");
  });
});

我正在尝试使用 systemName 创建文件夹，所以我使用了 map 函数，因此我可以借助 map 函数轻松地在这些文件夹中创建个人 Json 文件，fs.mkdir 我可以创建文件夹

现在我正尝试通过 systemConfig.json 存储 JSON 文件夹，但正在存储的数据仅是最后一个

它只存储相同 JSON

模式的 JSON 值

因为我的期望是这样的

期望

Dell/SystemConfig.json

    {
     {
       OS: "linux",
       harddisk: "125GB",
       Encrypted: "yes",
       password: "abc",
     },
     {
       OS: "Windows",
       harddisk: "125GB",
       Encrypted: "yes",
       password: "xyz",
     }
    }

但实际上它以这种格式存储数据

     {
       OS: "Windows",
       harddisk: "125GB",
       Encrypted: "yes",
       password: "xyz",
     }
    }

这跟在同一个 Lenovo 文件夹之后，我在 Lenovo 文件夹中也得到了相同的值

其中有额外的 } 如何将所有 Dell 详细信息存储在一个文件中

Answer 1

The map() method creates a new array populated with the results of calling a provided function on every element in the calling array.

所以，如果我正确理解了你的问题，那么你需要将写入文件的代码移到 map() 回调之外。

例如

let dataToWrite = details.map( data => {
    // do what you need to do here for every element

    return something
})

// write to file here

Answer 2

在这里，我在使用 reduce 写入文件之前格式化了数据。

  let details = [
    {
      value: { tag: [] },
      details: {
        system: "pc",
        systemName: "Dell",
        ram: "4GB",
      },
      Others: {
        OS: "linux",
        harddisk: "125GB",
        Encrypted: "yes",
        password: "abc",
      },
    },
    {
      value: { tag: [] },
      details: {
        system: "pc",
        systemName: "Dell",
        ram: "8GB",
      },
      Others: {
        OS: "Windows",
        harddisk: "125GB",
        Encrypted: "yes",
        password: "xyz",
      },
    },
    {
      value: { tag: [] },
      details: {
        system: "laptop",
        systemName: "Lenovo",
        ram: "4GB",
      },
      Others: {
        OS: "linux",
        harddisk: "256GB",
        Encrypted: "no",
        password: null,
      },
    },
    {
      value: { tag: [] },
      details: {
        system: "pc",
        systemName: "Lenovo",
        ram: "8GB",
      },
      Others: {
        OS: "Ubuntu",
        harddisk: "125GB",
        Encrypted: "yes",
        password: "abc",
      },
    },
    {
      value: { tag: [] },
      details: {
        system: "laptop",
        systemName: "hp",
        ram: "4GB",
      },
      Others: {
        OS: "linux",
        harddisk: "125GB",
        Encrypted: "yes",
        password: "abc",
      },
    },
  ];
  
  let formatted = details.reduce((acc,curr) => {
    if(!acc[curr.details.systemName]){
        acc[curr.details.systemName] = [];
    }
    acc[curr.details.systemName].push(curr.Others);
    return acc;
  },{})

console.log(formatted)

之后运行一个forEach通过格式化对象的keys数组

Object.keys(formatted).forEach((data) => {
    let folderPath = path.join(__dirname, data);
    if (!fs.existsSync(folderPath)){ //checking if folder not exists
        fs.mkdir(folderPath, (err) => {
            if (err) throw err;
        });
    }

    fs.writeFile(`${folderPath}/SystemConfig.json`, JSON.stringify(formatted[data], null, 4), (err) => {
      if (err) throw err;
      console.log("Data added Successfully");
    });
  });

您将获得
格式的数据 Dell/SystemConfig.json

[
    {
        "OS": "linux",
        "harddisk": "125GB",
        "Encrypted": "yes",
        "password": "abc"
    },
    {
        "OS": "Windows",
        "harddisk": "125GB",
        "Encrypted": "yes",
        "password": "xyz"
    }
]

有效json

使用节点 js / javascript 在一个文件中存储 JSON 数据值

storing JSON data value in one file using node js / javascript

javascript

json

nodes

node.js

期望