NodeJs入门——前后端数据交互

数据提交的两种方式：GET, POST

GET方式数据放在url里进行提交，容量有限，有缓存

//GET表单.html




  
  


  

    用户：

    密码：

    
  

 Node服务器获取用户名与密码

//get_server.js

const http=require('http');
const url=require('url');

createServer((req,res)=>{
  let query=url.parse(req.url, true);
  console.log('user:'+query.user+',password:'+query.pwd)
}).listen(8080)

 

url.parse解析的是整个url

 

url.parse(req.url, true)打印出来的内容：

Url {
  protocol: null,
  slashes: null,
  auth: null,
  host: null,
  port: null,
  hostname: null,
  hash: null,
  search: '?user=123&pwd=2345',
  query: { user: '123', pwd: '2345' },
  pathname: '/aaa',
  path: '/aaa?user=123&pwd=2345',
  href: '/aaa?user=123&pwd=2345' }

 POST方式数据放在http-body里，容量较大，无缓存

//post表单.html




  
  


  

    用户：

    密码：

    
  

//post_server.js

const http=require('http')
const querystring=require('querystring')

let server=http.createServer((req,res)=>{
  let str='';
  req.on('data',data=>{
    str+=data;
  })
  req.on('end',()=>{
    let post=querystring.parse(str);
    console.log(str,post)
  })
  res.end()
})
server.listen(8080)

简单地登录注册提交与数据校验

//index.html




  
  
  
  


  用户名：

  密  码：

  注册
  登录

//sub.js

$(()=>{
  $('#btn1').click(()=>{
    $.ajax({
      url:'/reg',
      type:GET,
      data:{user:$('#user').val(),pwd:$('#pwd').val()},
      dataType:'json',
      success(data){
        if(data.err){
          alert('错误'+data.msg)
        }else{
          alert('注册成功')
        }
      },
      error(){
        alert('出错了')
      }
    })
  });
  $('#btn2').click(()=>{
    $.ajax({
      url:'/login',
      type:GET,
      data:{user:$('#user').val(),pwd:$('#pwd').val()},
      dataType:'json',
      success(data){
        if(data.err){
          alert('错误'+data.msg)
        }else{
          alert('登录成功')
        }
      },
      error(){
        alert('出错了')
      }
    })
  })
})

服务器端数据校验

//server.js

const http=require('http');
const url=require('url');
const querystring=require('querystring');
const fs=require('fs')

let users={
	
}

let server=http.createServer((req,res)=>{
  // GET
  let {pathname,query}=url.parse(req.url,true);
  // console.log(pathname)
	
  // POST
  let str='';
  req.on('data',data=>{
    str+=data;
  })

  req.on('end',()=>{
    let post=querystring.parse(str)

    let {user, pwd}=query;

    switch(pathname){
      case '/reg':    //注册
        if(!user){
          res.write('{"err":1, "msg":"user is required"')
        }else if(!pwd){
          res.write('{"err":1, "msg":"pwd is required"}')
        }else if(!/^\w{8,32}$/.test(user)){
          res.write('{"err":1, "msg":"invaild user"}')
        }else if(/^['|"]$/.test(pwd)){
          res.write('{"err":1,"msg":"invaild password"}')
        }else if(users[user]){
          res.write('{"err":1, "msg":"user is existed"}')
        }else{
          users[user]=pwd;
          res.write('{"err":0, "msg":"reg success"}')
        }
        res.end()
        break;	
      case '/login':    //登录
        if(!user){
          res.write('{"err":1, "msg":"user is required"')
        }else if(!pwd){
          res.write('{"err":1, "msg":"pwd is required"}')
        }else if(!/^\w{8,32}$/.test(user)){
          res.write('{"err":1, "msg":"invaild user"}')
        }else if(/^['|"]$/.test(pwd)){
          res.write('{"err":1,"msg":"invaild pwd"}')
        }else if(users[user]!=pwd){
          res.write('{"err":1, "msg":"username or password is inaccuracy"}')
        }else if(!users[user]){
          res.write('{"err":0, "msg":"user is not found"}')
        }else{
          res.write('{"err":0, "msg":"login success"}')
        }
        res.end()
        break;
      default:        //其他
        fs.readFile(`www${pathname}`,(err,data)=>{
        if(err){
          res.writeHeader(404);
          res.write('not found')
        }else{
          res.write(data)
        }

        res.end()
      })
				
    }
  })
})

server.listen(8080)