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Specific use of canvas clipping () function

In canvas, you can use the clip() function to crop the area. After setting the cropping area, only the image in the area can be displayed, and the rest will be blocked. Draw a circle without using clipping.<!DOCTYPE html><html lang=en><head>

2025-02-18
JS judge the sample code of the constellation according to the date

Copy code code as follows: Function xingzuo () {var Start = 1901, date = document.GetelementByid ("txtDay"). Value, Month = Document.getelementbb

2025-02-17
Summary of the problems and solutions encountered in HTML5 Canvas Synthetic Poster

Foreword: I recently made a mobile item with Canvas synthetic poster pictures. Since there is no Canvas foundation, I went online to search for a predecessor's DEMO, but I encountered many problems during the development process. Now I will encounter

2025-02-17
The implementation method of using PhoneGap for local storage

Examples as: below:<!DOCTYPE html><html><head><meta charset=UTF-8><title> Database exmple</title>

2025-02-17
JavaScript takes position examples according to pixels

Copy code code as follows: <html><body><canvas id="canvas" style="background-color: #000;"/><script>function position (x,y){this.x = x;thi

2025-02-17
Inverse and reverse in javascript ~~No meaning

The operator ~ means bitwise inverse. On the surface, ~~ (inverse and inverse) has no meaning, but in fact, floating-point numbers can be turned into integers in JS. The code copy is as follows:<html><script> var myArray = new Array(); myArray.push("a"

2025-02-17
JavaScript write txt and read TXT file examples

1. Write the FileSystemObject to translate the file into a file stream. Step 1: Example: Copy code code as follows: var FSO = New Activexobject (scripting.filesystemObject); Create one to translate files to translate files into

2025-02-17
Ten practical CSS properties that IE does not support

When debugging a CSS problem, I often add borders to the specified element to accurately see what happens to the element and help determine the source of the problem. This is often effective because it gives me more specific visibility in the layout. But

2025-02-17
Detailed explanation of the control of the new attribute Audio audio and Video video (recommendation)

This article tells the control of H5 new attribute Audio audio and Video video. The details are as follows: 1. Audio (Audio)<audio controls=controls><source src=这里面放入音频文件路径></source></audio> 2. Video (VIDE

2025-02-17
Use JavaScript to increase the night mode to the webpage

Html+css: Copy code code as follows:<div></div> Copy code code as follows: <style>.cover{position:fixed;top: 0px;left: 0px;outline:5000px solid rgba(0, 0, 0,

2025-02-17
Window.showmodalDialog () Learning experience summary

Let ’s talk about the basic usage of Window.showmodalDialog.

2025-02-17
Detailed explanation of the solution to the problem that html2canvas screenshots cannot capture rounded corner images

Previously we could only capture images through other screenshot tools. The functions of modern browsers have become more and more powerful. With the gradual popularization of H5, the browser itself can take screenshots. html2canvas is such a front-end pl

2025-02-17
Revealing HTML5 and CSS3

The predecessor of the HTML 5 draft was called Web Applications 1.0. It was proposed by WHATWG in 2004, accepted by W3C in 2007, and established a new HTML working team. On January 22, 2008, the first official draft was released. HTML 5 is the biggest lea

2025-02-17
HTML converted to some summary of PDF case (multi -picture recommendation)

Due to the need to work, I recently studied the function of HTML converting into PDF. The key technology of HTML to PDF is how to handle the complex CSS style in the webpage. By collecting information on the Internet, it is found that the current HTML con

2025-02-17
HTML5 hybrid development QR code scanning and calling local camera

Today, my supervisor gave me a request, saying that I need to use hybrid development and use H5 to call the local camera to scan the QR code. I have done native Android QR code scanning before, mainly by calling the zxing plug-in. I also got a flash. But

2025-02-17

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