Question

我正在尝试读取和写入JSON文件，但我在执行它时有点困难。当我迭代更多记录时，我正试图在JSON文件中追加新数据。

// scripts.js

var jsonFile    = '../data/data.json';
var data        = { "id": 0, "animal": "Dog" }, { "id": 1, "animal": "Cat" };

var readData    = fs.read( jsonFile );

readData = readData.push( data );

fs.write( jsonFile, readData, 'a' );

-

我想要实现的目标

data.json

[]

data.json - 第一次迭代

[
    { "id": 0, "animal": "Dog" }, 
    { "id": 1, "animal": "Cat" }
]

data.json - 第二次迭代

[
    { "id": 0, "animal": "Dog" }, 
    { "id": 1, "animal": "Cat" },
    { "id": 2, "animal": "Owl" },
    { "id": 3, "animal": "Bat" }
]

Answer 1

在运行此文件之前，将[]放入'data.json'文件中。

const fs = require('fs-promise');

async function addRecord(jsonFile, row) {
  const json = await fs.readFile(jsonFile,'utf8');
  const rows = JSON.parse(json);
  rows.push(row);
  await fs.writeFile(jsonFile, JSON.stringify(rows));
}

async function test1() {
  const jsonFile = 'data.json';
  await addRecord(jsonFile, { "id": 0, "animal": "Dog" });
  await addRecord(jsonFile, { "id": 1, "animal": "Cat" });
}

test1().catch(console.error);

试图在PhantomJS上读写

1 个答案: