node初步一：HTTP请求

var http= require(‘http‘ );
var url= require(‘url‘ );
function start (){
       function onRequest(request ,response){
             var pathname =url .parse(request .url) .pathname ;// url.parse()解析请求头的url地址
             var query =url .parse(request .url) .query ;
            response .writeHead(200 ,{ ‘Content-Type‘ :‘text/plain; charset=utf-8‘}) ;
            response .write( "请求路径为：" +pathname +‘   ‘ );
            response .write( "请求参数为：" +query +‘   ‘ );

            response .write( "我是响应头的信息" );
            response .end() ;//响应结束
      }
      http .createServer(onRequest) .listen(9999) ;
      console .log( "服务器启动完成" );
}

start() ;