HW 4 is done.

TianhengHW4/untitled3/app.js

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+  var express = require("express");
+  var cheerio = require("cheerio");
+  var url = require("url");
+  var request = require("request");
+  var app = express();
+
+  app.get('/', function(req, res){
+    myModule.sayBye();
+    myModule.hello(" techbow");
+    console.log(myModule.sayBye.toString());
+    res.sendFile(__dirname + "/index.html");
+  });
+
+  app.get('/amazon/:name', function(req, res){
+    var name = req.params.name;
+    var options = {
+      protocol: "http:",
+      host: "www.amazon.com",
+      pathname: "/s/ref=nb_sb_noss_2",
+      query: {"field-keywords": name}
+    };
+    var amazonUrl = url.format(options);
+
+
+    request(amazonUrl, function(err,response, body){
+      var $ = cheerio.load(body);
+      var items = [];
+      var blocks = [];
+      $('li.s-result-item').each(function (k,e){
+       // console.log($(e).html());
+        var c = $(e).find("div.s-item-container>div:nth-child(3)>div.a-row:first-child>a>span.a-size-base").text();
+        //console.log(c);
+        //console.log(typeof(c.slice(1)));
+        if (items.length == 0){
+          items.push(c.slice(1));
+          blocks.push(e);
+        }
+        else{
+          if (parseFloat(c.slice(1))<parseFloat(items[0])){
+            items[0]= c.slice(1);
+            blocks[0]=e;
+          }
+        }
+        });
+      //console.log(blocks[0].tagName);
+      //console.log($(blocks[0]).parent().html());
+      $(blocks[0]).insertBefore('#result_0');
+     // $('#s-results-list-atf').prepend($(blocks[0]).html());
+      //console.log($('#s-results-list-atf').html())
+      res.send($.html());
+      })
+
+    });
+
+
+  app.listen(1234);

TianhengHW4/untitled3/bin/www

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+#!/usr/bin/env node
+
+/**
+ * Module dependencies.
+ */
+
+var app = require('../app');
+var debug = require('debug')('untitled3:server');
+var http = require('http');
+
+/**
+ * Get port from environment and store in Express.
+ */
+
+var port = normalizePort(process.env.PORT || '3000');
+app.set('port', port);
+
+/**
+ * Create HTTP server.
+ */
+
+var server = http.createServer(app);
+
+/**
+ * Listen on provided port, on all network interfaces.
+ */
+
+server.listen(port);
+server.on('error', onError);
+server.on('listening', onListening);
+
+/**
+ * Normalize a port into a number, string, or false.
+ */
+
+function normalizePort(val) {
+  var port = parseInt(val, 10);
+
+  if (isNaN(port)) {
+    // named pipe
+    return val;
+  }
+
+  if (port >= 0) {
+    // port number
+    return port;
+  }
+
+  return false;
+}
+
+/**
+ * Event listener for HTTP server "error" event.
+ */
+
+function onError(error) {
+  if (error.syscall !== 'listen') {
+    throw error;
+  }
+
+  var bind = typeof port === 'string'
+    ? 'Pipe ' + port
+    : 'Port ' + port;
+
+  // handle specific listen errors with friendly messages
+  switch (error.code) {
+    case 'EACCES':
+      console.error(bind + ' requires elevated privileges');
+      process.exit(1);
+      break;
+    case 'EADDRINUSE':
+      console.error(bind + ' is already in use');
+      process.exit(1);
+      break;
+    default:
+      throw error;
+  }
+}
+
+/**
+ * Event listener for HTTP server "listening" event.
+ */
+
+function onListening() {
+  var addr = server.address();
+  var bind = typeof addr === 'string'
+    ? 'pipe ' + addr
+    : 'port ' + addr.port;
+  debug('Listening on ' + bind);
+}