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Node.js uses Module module to divide different functions to simplify application development.

var myModule = require('./myModule.js');

Some methods and variables are exposed outside the module, which can be implemented using the exports object.

install
Installation of Node.js under Linux

sudo apt-get update
sudo apt-get install node
//Or:
sudo aptitude update
sudo aptitude install node

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var http = require('http');
server = http.createServer(function (req, res) {
res.writeHeader(200, {"Content-Type": "text/plain"});
res.end("Hello");
});
server.listen(8000);
console.log("httpd start @8000");

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console.log("Hello World");

node helloworld.js

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Node.js installation configuration

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install-node-msi-version-on-windows-step1

install-node-msi-version-on-windows-step2

install-node-msi-version-on-windows-step3

install-node-msi-version-on-windows-step5

Introduce required module
Create server
Receiving and responding to requests

Step 1: introduce the required module

var http = require("http");

Step 1. Create a server

Use the http.createServer() method to create the server, and use the listen method to bind port 8888 The function receives and responds to data through the request and response parameters.

double-click

  // Touch start time
  touchStartTime: 0,
  // Touch end time
  touchEndTime: 0,  
  // Last click event Click time
  lastTapTime: 0, 
  // Function to trigger after clicking event
  lastTapTimeoutFunc: null, 

  ///Event triggered by button touch
  touchStart: function(e) {
    this.touchStartTime = e.timeStamp
  },

  ///Event triggered by button touch end
  touchEnd: function(e) {
    this.touchEndTime = e.timeStamp
  },

 /// Click
  tap: function(e) {
    var that = this
    wx.showModal({
      title: 'Tips',
      content: 'Click event triggered',
      showCancel: false
    })
  },

//Double click
  doubleTap: function(e) {
    var that = this
    // Control the click event to be triggered within 350ms, and add this layer of judgment to prevent the click event from being triggered in a long time
    if (that.touchEndTime - that.touchStartTime < 350) {
      // Current click time
      var currentTime = e.timeStamp
      var lastTapTime = that.lastTapTime
      // Update last click time
      that.lastTapTime = currentTime

      // If the time of two clicks is within 300 milliseconds, it is considered as double-click event
      if (currentTime - lastTapTime < 300) {
        console.log("double tap")
        // Cancel the execution of the double click event when the double click event is triggered successfully
        clearTimeout(that.lastTapTimeoutFunc);
        wx.showModal({
          title: 'Tips',
          content: 'Double click event triggered',
          showCancel: false
        })
      }
    }
  },
  

//Click, double-click and long press simultaneously:

  //Long press
  longTap: function(e) {
    console.log("long tap")
    wx.showModal({
      title: 'Tips',
      content: 'Long press event triggered',
      showCancel: false
    })
  },

  ///Click, double-click
  multipleTap: function(e) {
    var that = this
    // Control the click event to be triggered within 350ms, and add this layer of judgment to prevent the click event from being triggered in a long time
    if (that.touchEndTime - that.touchStartTime < 350) {
      // Current click time
      var currentTime = e.timeStamp
      var lastTapTime = that.lastTapTime
      // Update last click time
      that.lastTapTime = currentTime
      
      // If the time of two clicks is within 300 milliseconds, it is considered as double-click event
      if (currentTime - lastTapTime < 300) {
        console.log("double tap")
        // Cancel the execution of the double click event when the double click event is triggered successfully
        clearTimeout(that.lastTapTimeoutFunc);
        wx.showModal({
          title: 'Tips',
          content: 'Double click event triggered',
          showCancel: false
        })
      } else {
        // The click event is executed with a delay of 300 ms, which is similar to that of the original browser.
        that.lastTapTimeoutFunc = setTimeout(function () {
          console.log("tap")
          wx.showModal({
            title: 'Tips',
            content: 'Click event triggered',
            showCancel: false
          })
        }, 300);
      }
    }
  },

var http = require('http');

http.createServer(function (request, response) {

    // Send HTTP header 
    // HTTP status value: 200: OK
    // Content type: text/plain
    response.writeHead(200, {'Content-Type': 'text/plain'});

    // Send response data "Hello World"
    response.end('Hello World\n');
}).listen(8888);

// The terminal prints the following information
console.log('Server running at http://127.0.0.1:8888/');

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