分别使用get,post方法进行提交.

如果输入用户名为admin时,鼠标失去焦点,显示不可以.

 

<!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>
    用户名: <input type="text" value="" id="tt">
    <span id="s"></span>
</body>
<script>
    var txt = document.getElementById('tt')
    txt.onblur = function(){
        var xhr = new XMLHttpRequest();
        xhr.onreadystatechange = function(){
     
            if(xhr.readyState == 4){
                if (xhr.responseText == 1) {
                    var h = '<font color = "red">不可以</font>';
                    document.getElementById('s').innerHTML = h;
                }else{
                    var h = '<font color = "green">可以</font>';
                    document.getElementById('s').innerHTML = h;
                }
            }}
            xhr.open('get','http://127.0.0.1:8080/getname?me=' + txt.value);
            xhr.send();
            // xhr.open('post','http://127.0.0.1:8080/getname');
            // xhr.send('me='+txt.value);
        
    }
</script>
</html>
//引用模块
var http = require('http');
var fs = require('fs');
var url = require('url');

//开启服务器
var server = http.createServer();
server.listen(8080,function(){
    console.log('启动')
})

server.on('request',function(req,res){
    var urls = url.parse(req.url, true);
        if(urls.pathname == '/gets'){
            res.end('get');
        }else if (urls.pathname == '/posts') {
            res.end('post');
        }else if(urls.pathname == '/getname'){
            // console.log(urls.query.me);
            if(urls.query.me == 'admin'){
                res.end('1');
            }else{
                res.end('0');
            }

            // var d ='';
            // req.on('data', function(post_data){
            //     d += post_data;
            // })
            // req.on('end', function(){
            //     var obj = require('querystring').parse(d);
            //     if(obj.me == 'admin'){
            //         res.end('1')
            //     }else{
            //         res.end('0');
            //     }
            // })
            

        }else{
            fs.readFile('.'+urls.pathname, function(err, data){
                if(!err){
                    res.end(data);
                }else{
                    res.end('')
                }
            })
        }
})