node实现简单的增删改查接口实例代码

node实现简单的增删改查接口的全部代码如下：

// 数据存储在users.json文件中
const express = require("express");
const fs = require("fs");
const cors = require("cors");
const bodyparser = require("body-parser");
const app = express();

app.use(cors({ origin: "*" })); // fix 跨域
app.use(bodyparser.json()); // for parsing application/json
app.use(bodyparser.urlencoded({ extended: true })); // for parsing application/x-www-form-urlencoded

// 新增
app.post("/adduser", (req, res) => {
 fs.readfile("./users.json", "utf8", (err, data) => {
  if (err) {
   throw err;
  }
  data = data ? json.parse(data) : [];
  data.push(req.body);
  fs.writefile("./users.json", json.stringify(data), err => {
   if (err) throw err;
   res.end();
  });
 });
});

// 删除
app.delete("/deluser/:id", (req, res) => {
 const id = req.params.id;
 fs.readfile("./users.json", "utf8", (err, data) => {
  data = json.parse(data) || [];
  const savedata = data.filter(item => item.id != id);
  fs.writefile("./users.json", json.stringify(savedata), err => {
   if (err) throw err;
   res.end();
  });
 });
});

// 修改
app.put("/update/:id", (req, res) => {
 const id = req.params.id;
 const body = req.body;
 fs.readfile(__dirname + "/" + "users.json", "utf8", (err, data) => {
  const userlist = (data && json.parse(data)) || [];
  const index = userlist.findindex(item => item.id == id);
  userlist[index] = { ...userlist[index], ...body };
  fs.writefile("./users.json", json.stringify(userlist), err => {
   if (err) throw err;
   console.log("修改");
   res.end();
  });
 });
});

// 列表查询
app.get("/listusers", function(req, res) {
  fs.readfile(__dirname + "/" + "users.json", "utf8", function(err, data) {
   console.log(data);
   res.end(data);
  });

});


app.listen(8081, function() {
 console.log("访问地址: http://localhost:8081");
});

以上就是全部相关代码，大家可以测试下，感谢大家对的支持。