1前台文件

<!doctype html>
<html>
<head>
    <meta charset="UTF-8" />
    <title>Document</title>
    <script typet="text/javascript" src="http://libs.baidu.com/jquery/1.9.1/jquery.min.js"></script>
    <style>
        form{padding: 100px;border: 1px solid red;width: 350px;margin: 0 auto;}
        form input{display: block;margin: 0 auto;margin-bottom: 20px;}
    </style>
    <script>
    $(function(){
    $('#register-sub').on('click',function(){
        var info = $('form').serialize();
        $.ajax({
            type:"get",
            url:"http://127.0.0.1:8081",
            data:info,
            success:function(response,status,xhr){
                alert(response);
                localStorage.name = $('input[name="name"]').val();
            }
        });
        return false;
    });
    
    $('#login-sub').on('click',function(){
        return false;
    });
});</script>
</head>
<body>
    <form id="register" action="" method="get">
        <input type="hidden" name="action" value="register" />
        用&ensp;户&ensp;名: <input type="text" name="name" placeholder="请输入用户名..." />
        密&emsp;&emsp;码: <input type="password" name="pass" placeholder="请输入密码..." />
        电子邮件：<input type="email" name="email" placeholder="请输入合法邮件名..." />
        <input id="register-sub" type="submit" value="注册" />
    </form>
</body>
</html>

2，server.js

var http = require('http');
var url = require('url');
var util = require('util');
var mysql = require('./mysql');//这个是自己写的用来向数据库写入用户的文件

http.createServer(function(req,res){
res.writeHead(200,{"Content-Type":'text/plain','charset':'utf-8','Access-Control-Allow-Origin':'*','Access-Control-Allow-Methods':'PUT,POST,GET,DELETE,OPTIONS'});
//解析URL参数
var params = url.parse(req.url,true).query;
var a=mysql.reg(params.action,params.name,params.pass,params.email);
var rr="safsaf"
res.write("注册成功");
res.end();
}).listen(8081);

3，mysql.js

// var http = require('http');

// http.createServer(function (request, response) {

//     // 发送 HTTP 头部 
//     // HTTP 状态值: 200 : OK
//     // 内容类型: text/plain
//     response.writeHead(200, {'Content-Type': 'text/plain'});


//         var mysql  = require('mysql');  
         
//         var connection = mysql.createConnection({     
//           host     : 'localhost',       
//           user     : 'root',              
//           password : 'root',       
//           port: '3306',                   
//           database: 'test', 
//         }); 
         

//              // body...

//         connection.connect();
         
//         var  sql = 'SELECT * FROM yueqi';
//         //查
//         connection.query(sql,function (err, result) {
//                 if(err){
//                   console.log('[SELECT ERROR] - ',err.message);
//                   return;
//                 }
         
//                // console.log('--------------------------SELECT----------------------------');
//                // console.log(result);
//                // console.log('------------------------------------------------------------\n\n');  

//         });
//         console.log(result);
//         // return res.jsonp(result);
//         response.end(result);
//         connection.end(); 






//     // 发送响应数据 "Hello World"
    
// }).listen(8888);





exports.reg = function (action,name,pass,email){
    var mysql  = require('mysql');  
   
    var connection = mysql.createConnection({     
      host     : 'localhost',
      user     : 'root',
      password : 'root',
      port: '3306',     
      database: 'test', 
    }); 
    
    connection.connect();
     
    var modSql = "insert into user (id,username,userpwd) values ('','"+name+"','"+pass+"')";
    
    connection.query(modSql,function (err, result) {
       if(err){
             console.log('[UPDATE ERROR] - ',err.message);
             return;
       }
    });
    connection.end();
}

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以上是get方式的，

post方式修改一下前台文件为post就可以了