Question

我正在运行快递节点服务器，我使用

        $.ajax({
            url: this.props.url,
            dataType: 'json',
            cache: false,
            success: function(data) {
                this.setState({data: data});
            }.bind(this),
            error: function(xhr, status, err) {
                console.error(this.props.url, status, err.toString());
            }.bind(this)
        });

在服务器上的json中获取数据。 json的数据如下：

[
 {
    "id": 1453464243666,
    "text": "abc"
 },
 {
    "id": 1453464256143,
    "text": "def"
 },
 {
    "id": 1453464265564,
    "text": "ghi"
 }
]

如何（执行什么请求）删除\修改此json中的任何对象？

Answer 1

要阅读JSON文件，您可以使用jsonfile模块。然后，您需要在快速服务器上定义put路由。快递服务器的代码片段，突出显示重要部分：

<强> app.js

// This assumes you've already installed 'jsonfile' via npm
var jsonfile = require('jsonfile');

// This assumes you've already created an app using Express.
// You'll need to pass the 'id' of the object you need to edit in
// the 'PUT' request from the client.
app.put('/edit/:id', function(req, res) {
    var id = req.params.id;
    var newText = req.body.text;

    // read in the JSON file
    jsonfile.readFile('/path/to/file.json', function(err, obj) {
      // Using another variable to prevent confusion.
      var fileObj = obj;

      // Modify the text at the appropriate id
      fileObj[id].text = newText;

      // Write the modified obj to the file
      jsonfile.writeFile('/path/to/file.json', fileObj, function(err) {
          if (err) throw err;
      });
    });
});

Answer 2

app.put('/edit/:id', (req,res) => {

  var id = req.params.id;
  var fname = req.body.fname;
  var lname = req.body.lname;
  var age = req.body.age;
  var address = req.body.address;
  var phone = req.body.phone;

  jsonfile.readFile("./users.json", function(err,data) {

    var fileObj = data;

    fileObj.users_array.map((curr) => {

      if(curr.id == id) {
        curr.fname = fname;
        curr.lname = lname;
        curr.age = age;
        curr.address = address;
        curr.phone = phone;
      }

    });

    jsonfile.writeFile('./users.json', fileObj, function(err) {
        if(err) throw err;
    });
});

Node.js如何删除服务器上json文件中的\ edit数据

2 个答案: