怎么请求小程序直播_从零开始学习Node.js系列教程

摘要: 从零刚开始学习培训Node.js系列产品实例教程二:文字递交与显示信息方式 本文关键详细介绍了Node.js文字递交与显示信息方式,融合案例方式剖析了nodejs根据http的文字递交、传送与...

从零开始学习Node.js系列教程二:文本提交与显示方法       这篇文章主要介绍了Node.js文本提交与显示方法,结合实例形式分析了nodejs基于http的文本提交、传输与显示相关操作技巧,需要的朋友可以参考下

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。




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