1.显示动态网页
又到了激动人心的时刻，马上就可以使用node创建动态网站了，其原理为：
- 在HTML模板中使用占位符
- 根据请求路径，确定需要返回的页面
- 根据请求参数来确定静态模板中占位符的值
- 使用正则匹配将占位符匹配为真实值
- 再res.write()到浏览器的
代码如下：
// server.js
var http = require("http");
var url = require('url');
var router = require('./router'); http.createServer(function(req, res){
if ( req.url !== '/favicon.ico'){
pathname = url.parse(req.url).pathname.replace(/\//,'');
console.log(pathname);
try {
router[pathname](req, res);
} catch(e) {
console.log('error:'+e);
res.writeHead(200, {'Content-Type': 'text/html;charset=utf-8'});
res.write(e.toString());
res.end();
};
}
}).listen(3000);
console.log("server running at http:127.0.0.1:3000");
/**
* router.js
*/
var fs = require('fs');
var url = require('url');
var querystring = require('querystring'); module.exports = {
login: function(req, res){
var post ='';
req.on('data', function(chunk){
post += chunk;
});
req.on('end', function(){
post = querystring.parse(post);
array = ['username', 'password'];
fs.readFile('./login.html', function(err, data){
if( err){
console.log(err);
res.writeHead(200, {'Content-Type': 'text/html;charset=utf-8'})
res.write(err.toString());
res.end();
} else {
res.writeHead(200, {'Content-Type': 'text/html;charset=utf-8'})
data = data.toString();
for(var i = 0; i < array.length; i++){
var reg = new RegExp("{{"+array[i]+"}}", 'g');
console.log(reg);
post[array[i]] = post[array[i]] == undefined ? '':post[array[i]];
data = data.replace(reg, post[array[i]]);
console.log(post[array[i]]);
}
res.write(data);
res.end();
}
})
})
},
register:function(req, res){
fs.readFile('.register.html', function(err, data){
if(err) {
console.log(err);
res.writeHead(200, {'Content-Type': 'text/html;charset=utf-8'})
res.write(err.toString());
res.end();
return;
} else{
res.writeHead(200, {'Content-Type': 'text/html;charset=utf-8'});
res.write(data);
res.end();
}
})
},
showImage:function(req, res){
fs.readFile('./test.png',function(err, data){
if (err) {
console.log(err);
return;
} else{
console.log("开始读取图片");
res.writeHead(200, {'Content-Type':'image/jpeg'});
res.write(data);
res.end();//写在互调函数外面会报错的哟
}
})
} }
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<body>
<img src="./showImage" alt="">
<h1>收到参数：username：{{username}}</h1>
<h1>收到参数：password：{{password}}</h1>
<form action="./login" method="POST">
<p>
<span>name</span>
<input type="text" name="username">
</p>
<p>
<span>password</span>
<input type="text" name="password">
</p>
<p>
<input type="submit" value="登录">
</p>
</form>
</body>
</html>