


Beautiful gradient background special effects code implemented by JS+CSS (6 gradient effects)_javascript skills
The example in this article describes the beautiful gradient background special effects code implemented by JS+CSS. Share it with everyone for your reference, the details are as follows:
The screenshot of the running effect is as follows:
The specific code is as follows:
<html> <head> <title> JS配合CSS实现的漂亮渐变背景特效6个实例 </title> <script> var setGradient = (function() { var p_dCanvas = document.createElement('canvas'); var p_useCanvas = !!(typeof(p_dCanvas.getContext) == 'function'); var p_dCtx = p_useCanvas ? p_dCanvas.getContext('2d') : null; var p_isIE = /*@cc_on!@*/ false; try { p_dCtx.canvas.toDataURL() } catch(err) { p_useCanvas = false; }; if (p_useCanvas) { return function(dEl, sColor1, sColor2, bRepeatY) { if (typeof(dEl) == 'string') dEl = document.getElementById(dEl); if (!dEl) return false; var nW = dEl.offsetWidth; var nH = dEl.offsetHeight; p_dCanvas.width = nW; p_dCanvas.height = nH; var dGradient; var sRepeat; if (bRepeatY) { dGradient = p_dCtx.createLinearGradient(0, 0, nW, 0); sRepeat = 'repeat-y'; } else { dGradient = p_dCtx.createLinearGradient(0, 0, 0, nH); sRepeat = 'repeat-x'; } dGradient.addColorStop(0, sColor1); dGradient.addColorStop(1, sColor2); p_dCtx.fillStyle = dGradient; p_dCtx.fillRect(0, 0, nW, nH); var sDataUrl = p_dCtx.canvas.toDataURL('image/png'); with(dEl.style) { backgroundRepeat = sRepeat; backgroundImage = 'url(' + sDataUrl + ')'; backgroundColor = sColor2; }; } } else if (p_isIE) { p_dCanvas = p_useCanvas = p_dCtx = null; return function(dEl, sColor1, sColor2, bRepeatY) { if (typeof(dEl) == 'string') dEl = document.getElementById(dEl); if (!dEl) return false; dEl.style.zoom = 1; var sF = dEl.currentStyle.filter; dEl.style.filter += ' ' + ['progid:DXImageTransform.Microsoft.gradient( GradientType=', +( !! bRepeatY), ',enabled=true,startColorstr=', sColor1, ', endColorstr=', sColor2, ')'].join(''); }; } else { p_dCanvas = p_useCanvas = p_dCtx = null; return function(dEl, sColor1, sColor2) { if (typeof(dEl) == 'string') dEl = document.getElementById(dEl); if (!dEl) return false; with(dEl.style) { backgroundColor = sColor2; }; } } })(); </script> <style> body{font:0.75em/1.4 Arial;text-align:left;margin:20px;} hr{clear:both;visibility:hidden;} xmp{font:12px/12px "Courier New";background:#fff;color:#666; border:solid 1px #ccc;} div.example{ border:solid 1px #555;margin:0 20px 20px 0;float:left; display:inline;margin:1em;background:#fff;width:300px;padding:40px;color:#222;font:xx-small/1.2 "Tahoma";text-align:justify;} </style> <body> <div id="example1" class="example"> CSS特效代码。 </div> <div id="example2" class="example"> 各类编程源码、 </div> <div id="example3" class="example"> 精品软件 </div> <div id="example4" class="example"> 上海世博园 </div> <div id="example5" class="example"> 我家北京天安门 </div> <div id="example6" class="example"> 北京欢迎您! </div> <script> setGradient('example1', '#4ddbbe', '#d449cc', 1); setGradient('example2', '#46ddbd', '#d8b617', 0); setGradient('example3', '#c81fc1', '#bf445f', 1); setGradient('example4', '#2285e5', '#d769eb', 0); setGradient('example5', '#8b4286', '#eac87d', 1); setGradient('example6', 'black', 'white', 0); </script> </body> </html>
Readers who are interested in more JavaScript-related content can check out the special topics on this site: "Summary of JavaScript search algorithm techniques", "Summary of JavaScript animation special effects and techniques", "Summary of JavaScript errors and debugging techniques", "Summary of JavaScript data structures and algorithm techniques", "Summary of JavaScript traversal algorithms and techniques" and "JavaScript Mathematics Summary of operation usage》
I hope this article will be helpful to everyone in JavaScript programming.

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The main uses of JavaScript in web development include client interaction, form verification and asynchronous communication. 1) Dynamic content update and user interaction through DOM operations; 2) Client verification is carried out before the user submits data to improve the user experience; 3) Refreshless communication with the server is achieved through AJAX technology.

Understanding how JavaScript engine works internally is important to developers because it helps write more efficient code and understand performance bottlenecks and optimization strategies. 1) The engine's workflow includes three stages: parsing, compiling and execution; 2) During the execution process, the engine will perform dynamic optimization, such as inline cache and hidden classes; 3) Best practices include avoiding global variables, optimizing loops, using const and lets, and avoiding excessive use of closures.

Python is more suitable for beginners, with a smooth learning curve and concise syntax; JavaScript is suitable for front-end development, with a steep learning curve and flexible syntax. 1. Python syntax is intuitive and suitable for data science and back-end development. 2. JavaScript is flexible and widely used in front-end and server-side programming.

Python and JavaScript have their own advantages and disadvantages in terms of community, libraries and resources. 1) The Python community is friendly and suitable for beginners, but the front-end development resources are not as rich as JavaScript. 2) Python is powerful in data science and machine learning libraries, while JavaScript is better in front-end development libraries and frameworks. 3) Both have rich learning resources, but Python is suitable for starting with official documents, while JavaScript is better with MDNWebDocs. The choice should be based on project needs and personal interests.

The shift from C/C to JavaScript requires adapting to dynamic typing, garbage collection and asynchronous programming. 1) C/C is a statically typed language that requires manual memory management, while JavaScript is dynamically typed and garbage collection is automatically processed. 2) C/C needs to be compiled into machine code, while JavaScript is an interpreted language. 3) JavaScript introduces concepts such as closures, prototype chains and Promise, which enhances flexibility and asynchronous programming capabilities.

Different JavaScript engines have different effects when parsing and executing JavaScript code, because the implementation principles and optimization strategies of each engine differ. 1. Lexical analysis: convert source code into lexical unit. 2. Grammar analysis: Generate an abstract syntax tree. 3. Optimization and compilation: Generate machine code through the JIT compiler. 4. Execute: Run the machine code. V8 engine optimizes through instant compilation and hidden class, SpiderMonkey uses a type inference system, resulting in different performance performance on the same code.

JavaScript's applications in the real world include server-side programming, mobile application development and Internet of Things control: 1. Server-side programming is realized through Node.js, suitable for high concurrent request processing. 2. Mobile application development is carried out through ReactNative and supports cross-platform deployment. 3. Used for IoT device control through Johnny-Five library, suitable for hardware interaction.


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