从零开始学习Node.js系列教程二：文本提交与显示方法_JavaScript

从零开始学习Node.js系列教程二：文本提交与显示方法

本文实例讲述了node.js文本提交与显示方法。分享给大家供大家参考，具体如下：

index.js

var server = require("./server");
var router = require("./router");
var requesthandlers = require("./requesthandlers");
var handle = {}
handle["/"] = requesthandlers.start;
handle["/start"] = requesthandlers.start;
handle["/upload"] = requesthandlers.upload;
server.start(router.route, handle);

server.js

var http = require("http");
var url = require("url");
function start(route, handle) {
 function onrequest(request, response) {
  var postdata = "";
  var pathname = url.parse(request.url).pathname;
  console.log("request for " + pathname + " received.");
  request.setencoding("utf8");
  request.addlistener("data", function(postdatachunk) {
   postdata += postdatachunk;
   console.log("received post data chunk '"+
   postdatachunk + "'.");
  });
  request.addlistener("end", function() {
   console.log("data received ending" + pathname);
   route(handle, pathname, response, postdata);
  });
 }
 http.createserver(onrequest).listen(8888);
 console.log("server has started.");
}
exports.start = start;

requesthandlers.js

var querystring = require("querystring");
function start(response, postdata) {
 console.log("request handler 'start' was called.");
 var body = '<html>'+
  '<head>'+
  '<meta http-equiv="content-type" content="text/html; '+
  'charset=utf-8" />'+
  '</head>'+
  '<body>'+
  '<form action="/upload" method="post">'+
  '<textarea name="text" rows="20" cols="60"></textarea>'+
  '<input type="submit" value="submit text" />'+
  '</form>'+
  '</body>'+
  '</html>';
  response.writehead(200, {"content-type": "text/html"});
  response.write(body);
  response.end();
}
function upload(response, postdata) {
 console.log("request handler 'upload' was called.");
 response.writehead(200, {"content-type": "text/plain"});
 response.write("you've sent the text: "+
 querystring.parse(postdata).text);
 response.end();
}
exports.start = start;
exports.upload = upload;

router.js

function route(handle, pathname, response, postdata) {
 console.log("about to route a request for " + pathname);
 if (typeof handle[pathname] === 'function') {
  handle[pathname](response, postdata);
 } else {
  console.log("no request handler found for " + pathname);
  response.writehead(404, {"content-type": "text/plain"});
  response.write("404 not found");
  response.end();
 }
}
exports.route = route;

result:

知识点：

require和exports的用法：

index.js中代码

var hello = require('.hello');
hello = new hello();
hello.setname('joey');
hello.sayhello();

hello.js中代码

function hello(){
  var name;
  this.setname = function(thyname){
    name = thyname;
  }
  this.sayhello = function(){
    console.log('hello ' + name);
  }
}
//exports.hello = hello; //此时我们在其他文件中需要通过 require('./hello').hello来获取hello对象，这种写法有点冗余
module.exports = hello; //输出的就是hello对象本身，不是上面的exports，上面的是暴露.hello，.hello赋予了hello对象

希望本文所述对大家nodejs程序设计有所帮助。