var express = require('express');
var fs=require("fs");
var app = express();

//方法1：通过express.static访问静态文件，这里访问的是ajax.html
// app.use(express.static("./"));

//方法2：使用fs.readFile打开html文件
app.get("/helloworld.html", function(request, response) {
 fs.readFile("./"+request.path.substr(1),function(err,data){
  // body
  if(err){
   console.log(err);
   //404：NOT FOUND
   response.writeHead(404,{"Content-Type":"text/html"});
  }
  else{
   //200：OK
   response.writeHead(200,{"Content-Type":"text/html"});
   response.write(data.toString());
  }
  response.end();
 });
});

app.listen(3000, function() { //监听http://127.0.0.1:3000端口
 console.log("server start");
});