node 触发监听事件

var http = require('http');
var server = http.createServer()

server.on('request',function(req,res){
    res.writeHead(200,{"Content-type":"text/html"});
    console.log(req.url)
    res.end('haha');
});

server.on('haha',function(a,b){
    console.log('a + b = ' + (a + b));
});

server.emit('haha',1,2);
server.listen(8000);