如何在Braces/{}中设置所有json代码？

Question

我有一个问题，如何在Braces/{}中设置json代码？

下面的所有代码都解释了我需要做的事情

我想做这个登录系统，如果我有任何错误，我很抱歉

看上去像那样

{
  "test": "test",
  "test1": "test1"
}

我的密码

var usac = JSON.stringify({username: newusername, password: newpassword }, null, 2)
fs.appendFile('account.json', usac, fin)

function fin(err){
console.log("done")
}

我的json代码

{
  "username": "test",
  "password": "test"
}{
  "username": "test1",
  "password": "test1"
}{
  "username": "test2",
  "password": "test2"
}{
  "username": "test3",
  "password": "test3"
}{
  "username": "test4",
  "password": "test"
}

我想要代码是对的

{
  "user" :{
  "username": "test",
  "password": "test"
  }

  "user1" :{
  "username": "test1",
  "password": "test1"
  }

  "user2" :{
  "username": "test2",
  "password": "test2"
  }

  "user3" :{
  "username": "test3",
  "password": "test3"
  }
  
  "user4" :{
  "username": "test4",
  "password": "test4"
  }
}

Answer 1

您正在附加到一个json文件。但是，内容并不是json。

一个快速解决办法是：

value.

• Stringify

• 创建以{}作为初始内容的文件。

• 读取文件

• ，将内容解析为JavaScript对象

• 将解析对象中的新帐户对象设置为username作为密钥& account对象为，JavaScript

1. 与字符串数据H 215G 216相同的文件

const fs = require('fs');
class AccountsInterface {
  constructor(filePath) {

    this.filePath = filePath;

  }
  
  getAll(callback) {

    fs.readFile(this.filePath, function onReadComplete(error, content) {
      if(error) {
        return callback(error);
      }
      const accountsMap = JSON.parse(content.toString());
      callback(null, accountsMap);
    });

  }

  addAccount(account, callback) {

    const self = this;
    self.getAll(function onAccountsLoaded(error, accountsMap) {
      if(error) { return callback(error); }
      accountsMap[account.username] = account;
      const accountsMapString = JSON.stringify(accountsMap);
      fs.writeFile(self.filePath, accountsMapString, function onWriteComplete(error) {
        if(error) { return callback(error); }
        callback();
      });
    });

  }

  // Async version
  async getAllAsync() {
    const content = await fs.promises.readFile(this.filePath);
    const accountsMap = JSON.parse(content.toString());
    return accountsMap;
  }

  async addAccountAsync(account) {
    const accountsMap = await this.getAllAsync();
    accountsMap[account.username] = account;
    const accountsMapString = JSON.stringify(accountsMap);
    await fs.promises.writeFile(this.filePath, accountsMapString);
  }
  
}

// Ensure this file's contents are `{}` in the beginning
const accountsFilePath = './accounts.json';
const accountsInterface = new AccountsInterface(accountsFilePath);

const account = { username: 'test', password: 'test'};
accountsInterface.addAccount(account, onAccountAdded);
function onAccountAdded(error) {
  if(error) { return console.log(error); }
  // here, the accounts file will look like {"test": {"username": "test", "password": "test"}}
}

// Async version
const account = { username: 'test2', password: 'test2'};
await accountsInterface.addAccountAsync(account);
// here, the accounts file will look like {"test": {"username": "test", "password": "test"}, "test2": {"username": "test2", "password": "test2"}}