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Introduction to the meanings of top, parent, and opener of JS window objects

1.top This change always refers to the browser window at the highest level of the split window. If you plan to execute commands from the highest level of the split window, you can use the top variable. 2.openeropener is used to reference the object of the

2025-01-25
Detailed explanation of the attributes and methods of the video tag in Html5

Preface I am writing a custom player recently. Before writing, we must go through all the properties and methods of the player. Only by knowing our enemies and ourselves can we be able to fight through a hundred battles... Later, we will write the player

2025-01-25
A simple example of js reading the number of clicks (reading from the database)

It is to get the total number of clicks every time it is clicked, right? 1. You can drag a hidden button control on the server side, and then write the Click event of the button. The function of this event is to retrieve the total number of clicks from th

2025-01-25
Example of image rotation using html5 Canvas

As we all know, canvas is a bitmap, and you can render what you want in it, but you can only edit it by manipulating the properties of the canvas. That is to say, you cannot manipulate things drawn into the canvas. For example, if I add a painting to the

2025-01-25
A brief analysis of the pitfalls of JavaScript prototypal inheritance

JavaScript uses prototypal inheritance by default. Although there is no concept of a class, its function can act as a constructor. The constructor combined with this and new can build a Java-like class. Therefore, JavaScript can simulate classes by extend

2025-01-25
Implementation code of js running algorithm

Copy it first and see the running effect. The essence used is the setInterval() method: Copy the code and the code is as follows:

2025-01-25
Implementation of basic collision detection for Html5 Canvas animation

To perform collision detection in Canvas, people often directly use the built-in collision detection function of the game engine (Cocos2d-JS, Egret) or physics engine (Box2D). Are you curious, have you ever thought about their internal operating mechanism

2025-01-25
Implementation of HTML5 offline application and client storage

Supporting offline Web application development is another focus of HTML5. The so-called offline web applications are applications that can still run even when the device cannot access the Internet. Developing offline web applications requires several step

2025-01-25
JavaScript string replacement and string splitting sample code

JS (JavaScript) string replacement function (a bit like PHP's preg_replace) str.replace('xxx', 'yyyy'); replace the first str.replace(/xxx/g, 'yyyy'); replace all strings Split (similar to P

2025-01-25
JS small function (setInterval to achieve picture effect display time) example code

Effect: Code: Copy the code. The code is as follows: <head runat="server"><title></title><script type="text/javascript">function toDou(n) {if (n < 10) {return

2025-01-25
js countdown jump example after a few seconds

Copy the code code as follows:<html><head><title> Something went wrong~~~</title>

2025-01-25
Html5 localStorage Getting Started Tutorial

Defining read-only localStorage allows you to access the remote (origin) object storage of a Document; data is stored as a cross-browser session. localStorage is similar to sessionStorage, the difference is that the data is stored in localSt

2025-01-25
js numerical value converted to 3-digit comma separated sample code

Example code: Copy the code as follows: function formatNum(strNum) {if (strNum.length <= 3) {return strNum;}if (!/^(/+|-)?(/d+)(/./d+) ?$/.test(str

2025-01-25
Introduction to the use of anonymous functions in js

1. Overview of anonymous functions The first time I got to know anonymous functions was in the jquery source code. When I opened jQuery, the first thing I saw was the copied code: (function(window, undefined) {........... ............})(wind

2025-01-25
Detailed explanation of rapid development of network topology diagram applications based on HTML5

Starting today, we will analyze how to build an HTML5 Canvas topology graph application from the most basic level. HT internally encapsulates a topology graph component ht.graph.GraphView (hereinafter referred to as GraphView), which is the component with

2025-01-25

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