Node.js 把图片流送到客户端

var http=require(‘http‘);
var fs=require(‘fs‘);
var path=require(‘path‘);
var mime=require(‘mime‘);
var cache={};


var server=http.createServer(function(request,response){
    response.writeHead(200,{‘Content-Type‘:‘image/png‘});
    fs.createReadStream(‘./public/img/jkx.png‘).pipe(response);
}
);

server.listen(3000,function(){
    console.log(‘Server is listenning on port 3000.‘);
});