借助node.js + mysql 学习基础ajax~

很多小白不知道ajax怎么学，所以就弄了个node后台模拟下基本的ajax请求。

环境要求是安装node~

先上linkMysql.js



var mysql = require('mysql')

var connection = mysql.createConnection({

  host: 'localhost',

  user: 'root',

  password: '', //自己数据库的密码

  database: ''//自己数据库的名称

})

function LinkMysql(tableName, key, value) {

  connection.connect()

  var data = ''

  var sql = 'SELECT * FROM ' + tableName +' where ' + key + '=' + value

  console.log(sql)

  return new Promise(function(resolve,reject) {

    connection.query(sql, function(err, result) {

      console.log('--------------------------SELECT----------------------------');

      console.log(result);

      console.log('------------------------------------------------------------\n\n');

      resolve(result)

    })

  })

}

function cutMysql() {

  connection.end();

}

module.exports = {

  cutMysql,

  LinkMysql

}

主JS server.js,提供连接maysql和不连接mysql两种版本



var http = require('http')

var url = require('url');

var util = require('util');

var sqlFunc = require('./linkMysql.js');

// 不连接数据库操作

// var tempJson = [{

//   name: '巧克力',

//   price: 10

// },{

//   name: '薯条',

//   price: 20

// }]

http.createServer(function(req, res) {

  // 跨域处理

  res.setHeader("Access-Control-Allow-Origin", "*");

  res.setHeader("Access-Control-Allow-Headers", "X-Requested-With");

  res.setHeader("Access-Control-Allow-Methods","PUT,POST,GET,DELETE,OPTIONS");

  res.setHeader("X-Powered-By",' 3.2.1');

  res.setHeader("Content-Type", "application/json");

  var reqUrl = req.url

  var mainPath = reqUrl.split('?')[0]

  var reqData = reqUrl.split('?')[1].split('=')

  if (mainPath == '/test') {

    sqlFunc.LinkMysql('goods_info', reqData[0], JSON.stringify(decodeURIComponent(reqData[1]))).then(function(val) {

      console.log('从数据库获取数据' + val)

      sqlFunc.cutMysql();

      res.writeHead(200, {'content-Type': 'text/plain; charset=utf-8'});

      res.end(JSON.stringify(val));

    })

    // 不连接数据库操作

    // res.writeHead(200, {'content-Type': 'text/plain; charset=utf-8'});

    // res.end(JSON.stringify(tempJson));

  } else {

    res.writeHead(404, {'content-Type': 'text/plain; charset=utf-8'});

  }

}).listen(3000);

console.log('Server running at http://localhost:3000');

最后就是前端html页面了~test.html,用了原生写法，具体的就不讲了百度一大堆~

```<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
</head>
<body>
<div>数据请求</div>
<div class="box">

</div>

<script>

var xhr = new XMLHttpRequest()

xhr.onreadystatechange = function(){

  if (xhr.readyState == 4) {

    if ((xhr.status &gt;= 200 &amp;&amp; xhr.status &lt; 300) || xhr.status == 304) {

      console.log(xhr.responseText)

      var data = JSON.parse(xhr.responseText)

      var str = ''

      for(var i = 0; i &lt; data.length; i ++) {

        str += "&lt;div&gt;name: " + data[i].name + "&lt;/div&gt;&lt;div&gt;price: " + data[i].price + "&lt;/div&gt;"

      }

      document.querySelector('.box').innerHTML = str

    } else {

      console.log("Request was unsuccessful: " + xhr.status)

    }

  }

}

xhr.open('get', 'http://localhost:3000/test?name=巧克力', true)

xhr.send(null)

</script>

</body>

</html>



<p>命令行输入<br>node server.js 启动服务  刷新test.html页面就能拿到数据了~</p>

来源：https://segmentfault.com/a/1190000016700988

巴特西

借助node.js + mysql 学习基础ajax~

很多小白不知道ajax怎么学，所以就弄了个node后台模拟下基本的ajax请求。

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