var c

The rain animation produced by Canvas and the rain animation by canvas Introduction It is interesting to see a Canvas rain effect animation on codepen. I have studied it. Here I will share my implementation skills. Effect: Canvas animation

"The IP address is a 32-bit IP address, which is divided into four segments. Each segment has eight digits, which are expressed in decimal numbers. The value range of each segment is 0 ~ 255. segments and segments are separated by periods ." As a

Translate, rotate, scale, and canvasrotate for Canvas plottingCanvas operations The canvas drawing environment is changed through translate (), scale (), rotate (), setTransform (), and transform (), which will affect the transformation matrix of

In this article, we will continue to learn javascript closures. Understanding JavaScript closures is the only way to move towards Advanced javascript programmers. For more information, see 1. What is a closure? The official explanation is: a

There are 5 ways to implement JS inheritance:1, inherit the first way: Object posingfunction Parent (username) {This.username = Username;This.hello = function () {alert (this.username);}}function Child (Username,password) {Inheritance is implemented

Google's friends who often use google will surely remember the beautiful calendar controls of google, so we will also implement one. Although the functions and effects are not as good as those, however, the most important thing is that google's

The following is an example of the stored procedure I wrote in my project. For more information, see! * The method for calling the stored procedure in SQLPLUS is as follows: * setserveroutputon; varCvarchar2 ( The following is an example of the

Scope in a functionThe so-called function scope, that is, all the variables that belong to this function can be used and reused throughout the scope of the function.1 function foo (a) {2 var b=a;3 function Bar (c) {4

Http://www.jb51.net/article/24101.htmClosures (closure) are a difficult and unique feature of the JavaScript language, and many advanced applications rely on closures.The scope of a variableTo understand closures, you must first understand the

JS code from compile to executionWe write a JS code, JS engine is not in the order we write from top to bottom in order to compile and execute, first of all, according to their own rules of our code compiled first, and then from the top to the

Shallow copy and deep copy of JS objecti10630226 font: [Increase decrease] Type: Reprint time: 2016-09-05 I want to commentThis article mainly for you in detail the JavaScript object of the shallow copy and deep copy code, with a certain reference

Define the Circle class, member function area () with member variable r, constant pi, and calculated areas1. Factory modevar Circle = function () { var obj = new Object (); Obj. PI = 3.14159; Obj.area = function (r) { return this. PI *

What is the inheritance of non-constructors?For example, there is now an object called "Chinese". var Chinese = {Nation: ' China '}; There is also an object called "Doctor". var Doctor ={Career: ' Doctor '} How can I let "

Introduction to the use of classes in JavaScriptES6 For javascript, classes are an optional (not mandatory) design pattern, and the implementation of classes in [[Prototype] languages such as JavaScript is very poor. This lame feeling is not only

The conversion rules for converting to a Boolean value in javascript are: 1. The special values undefined and null are converted to false. 2. The numbers 0 and NaN change to false. 3. Convert the null string to false. 4. All other values are changed

Http://www.cnblogs.com/xzbrillia/archive/2012/07/22/2603638.html After testing dozens of images, it is concluded that C # uses TPL (task parallel Library) 2-10 times faster than C ++. Release vs2012 RC By the way, you need a dx11 video card.

Original http://www.cnblogs.com/aehyok/archive/2013/04/22/3035302.html Determine the isauthenticated method of the request before and after logon. Because the server segmentCodeExecute different scripts, so we need to extract the Loder public code

Recently, nosql databases are very popular, so I started to learn MongoDB with the attitude of keeping pace with the times. The best way to learn is to manually make an instance, so I chose the frequently used tree structure as an example for

This lesson shows you two examples. Of course, they are very simple. The first effect is the color selector. The effect is as follows: I think many people have done this in other versions. By the way, this is a simple implementation in HTML5.

Add the following icon to imagelist1: Tips about overlayindex: Before specifying an overlayindex for a node, use imagelist1.overlay to specify the available overlayindex number. Test: Unit unit1; interfaceuses windows,