nodejs 写服务器解决中文乱码问题：https://blog.csdn.net/worldmakewayfordream/article/details/77483423
var http = require('http');
var dt = require('./DateModule')
http.createServer(function(req, res){
res.writeHeader(200, {'Content-Type' : 'text/html;charset:utf-8'
});
res.write('<head><meta charset="utf-8"/></head>');
res.write("The date and time are currently: " + dt.myDateTime());
res.end('Hello world! 你好');
}).listen(8080);