nodejs操作json数据项目案例（增删改查）

---

node路由文件

引入模块

// 引入 http 模块
const http = require("http");
// 引入读写文件模块
const fs = require("fs");
// 引入路径模块
const path = require("path");
// 引入 mime 模块
const mime = require("mime");
// 引入 moment 模块
const moment = require("moment");
// 引入 url 模块，用来处理 url 路径
const url = require("url");
// 创建http服务
const app = http.createServer();

监听请求处理函数

app.on("request", (req, res) => {
  // 排除不必要的请求
  if (req.url == "/favicon.ico") {
    return;
  }
  // 处理url
  let myUrl = new URL(req.url, "http://127.0.0.1:3030/");
  // 处理静态文件
  postStatic(req, res);
  // 声明变量，存储 data.json 文件路径
  let file_path = path.join(__dirname, "public", "static", "data.json");
  if (myUrl.pathname == "/api/list") {
    let json = fs.readFileSync(file_path);
    // 将数据转换成数组
    let json_data = JSON.parse(json);
    json_data.forEach((item) => {
      let result = moment(item.create_time).format("YYYY-MM-DD HH:mm:ss");
      item.create_time = result;
    });
    res.end(JSON.stringify(json_data));
  } else if (myUrl.pathname == "/api/add") {
    let postData = "";
    req.on("data", (params) => {
      postData += params;
    });
    req.on("end", () => {
      // 读取 data.json 文件
      let blogs = JSON.parse(fs.readFileSync(file_path, "utf8"));
      blogs.push(JSON.parse(postData));
      fs.writeFileSync(file_path, JSON.stringify(blogs), "utf8");
      res.end("success");
    });
  } else if (myUrl.pathname == "/api/blog") {
    let id = myUrl.searchParams.get("id");
    let blogs = JSON.parse(fs.readFileSync(file_path, "utf8"));
    let filter_data = blogs.filter((item) => {
      return item.id == id;
    });
    res.end(JSON.stringify(filter_data[0]))
  } else if (myUrl.pathname == '/api/edite') {
    let postData = ''
    req.on('data', params => {
      postData += params
    })
    req.on('end', () => {
      // 将 postData 转换成json对象
      let json = JSON.parse(postData)
      // 读取 data.json 文件
      let blogs = JSON.parse(fs.readFileSync(file_path, "utf8"));
      blogs.forEach(item => {
        if (item.id == json.id) {
          item.title = json.title
        }
      })
      fs.writeFileSync(file_path, JSON.stringify(blogs), "utf8");
      res.end('success')
    })
  } else if (myUrl.pathname == '/api/delete') {
    let id = myUrl.searchParams.get("id");
    let blogs = JSON.parse(fs.readFileSync(file_path, "utf8"));
    blogs.filter((item, key) => {
      if (item.id == id) {
        blogs.splice(key, 1)
      }
    })
    fs.writeFileSync(file_path, JSON.stringify(blogs), "utf8");
    res.end('success')
  }
});
// 启动服务，并设置监听端口
app.listen("3030", () => {
  console.log("Server is running at http://127.0.0.1:3030");
});

监听请求类型

function postStatic(req, res) {
  const mime_arr = [
    "image/jpeg",
    "image/png",
    "application/javascript",
    "text/css",
    "text/html",
  ];
  let myUrl = new URL(req.url, "http://127.0.0.1:3030/");
  let type = mime.getType(myUrl.pathname);
  if (mime_arr.indexOf(type) != -1) {
    let static_file_path = path.join(
      __dirname,
      "public",
      "static",
      myUrl.pathname
    );
    let content = fs.readFileSync(static_file_path);
    res.end(content);
  }
}

http请求函数

function http_get(url,callback){
    let xhr=new XMLHttpRequest()
    xhr.open('get',url)
    xhr.onreadystatechange=()=>{
        if(xhr.readyState==4 && xhr.status==200){
            callback && callback(xhr.responseText)
        }
    }
    xhr.send()
}
function http_post(url,params,callback){
    let xhr=new XMLHttpRequest()
    xhr.open('post',url)
    xhr.onreadystatechange=()=>{
        if(xhr.readyState==4 && xhr.status==200){
            callback && callback(xhr.responseText)
        }
    }
    xhr.setRequestHeader('Content-type','application/x-www-form-urlencoded')
    xhr.send(JSON.stringify(params))
}

首页展示文章

页面截图

核心代码

html部分

<div class="container">
  <a style="margin-bottom: 10px;" href="/add.html" class="btn btn-primary">添加a>
  <table class="table">
    <thead>
      <tr>
        <th>编号th>
        <th>标题th>
        <th>时间th>
        <th>操作th>
      tr>
    thead>
    <tbody>tbody>
  table>
div>

js部分

<script src="/http.js">script>
<script>
  http_get("/api/list", (data) => {
      
    let blogs = JSON.parse(data);
    blogs.forEach((item, index) => {
      
      let tr = `
        
          ${
        item.id}
          ${
        item.title}
          ${
        item.create_time}
          
            ${
        item.id} >修改
            ${
        item.id}>删除
          
        `;
      document.querySelector("tbody").insertAdjacentHTML("afterbegin", tr);
    });
  });
  // 事件委托的方式位编辑和删除添加单击事件
  let tbody = document.querySelector('tbody')
  tbody.addEventListener('click', event => {
      
    var id = event.target.dataset.id
    console.log(event.target.innerHTML);
    if (event.target.innerHTML == '修改') {
      
      window.location.href = 'edite.html?id=' + id
    } else if (event.target.innerHTML == '删除') {
      
      http_get("/api/delete?id=" + id, (data) => {
      
        if (data == "success") {
      
          window.location.href = "index.html";
        }
      });
    }
  })
script>

添加文章

运行展示

核心代码

html部分

<div class="form-group">
  <label for="title">标题：label>
  <input type="text" class="form-control" id="title" placeholder="请输入标题"/>
div>
<a href="/index.html" class="btn btn-primary">添加a>

js部分

    <script src="/http.js">script>
    <script>
      document.querySelector(".btn").addEventListener("click", () => {
      
        let params = {
      
          id: S4(),
          title: document.querySelector("#title").value,
          create_time: Date.now(),
        };
        http_post("/api/add", params, (data) => {
      
          if (data == "success") {
      
            //   window.location.href = "/index.html";
          }
        });
      });
      function S4() {
      
        let stamp = new Date().getTime();
        return (((1 + Math.random()) * stamp) | 0).toString(16);
      }
    script>

修改文章

运行截图

核心代码

html部分

<div class="form-group">
    <label for="title">修改标题：label>
    <input type="text" class="form-control" id="title">
div>
<a href="/index.html" class="btn">取消a>
<button type="submit" class="btn btn-default">修改button>

js部分

<script src="/http.js">script>
<script>
  // 获取传递过来的博客 id 的值
  let id = window.location.search.split("=")[1];
  http_get("/api/blog?id=" + id, (data) => {
      
    let json = JSON.parse(data);
    document.querySelector("#title").value = json.title;
  });
  document.querySelector("button").addEventListener("click", () => {
      
    let params = {
      
      id: id,
      title: document.querySelector("#title").value,
    };
    http_post("/api/edite", params, (data) => {
      
      if (data == "success") {
      
        window.location.href = "index.html";
      }
    });
  });
script>

删除文章

运行截图

核心代码

js部分

http_get("/api/delete?id=" + id, (data) => {
  if (data == "success") {
    window.location.href = "index.html";
  }
});

源码下载

https://download.csdn.net/download/chuenst/14950577