The DOM represents it as:
\n<\/p>\n\n
- Document\n - html\n - head\n - title\n - body\n - h1\n - p\n<\/pre>\n\n\n\n\n
\n\n\n \n \n Accessing the DOM<\/strong>\n<\/h3>\n\n
JavaScript provides methods to select and manipulate DOM elements. <\/p>\n\n
\n \n \n Common Selection Methods<\/strong>\n<\/h4>\n\n
\n
- \ngetElementById<\/strong>\nSelects an element by its ID.\n<\/li>\n<\/ol>\n\n
const title = document.getElementById(\"title\");\n console.log(title.innerText); \/\/ Output: Hello, DOM!\n<\/pre>\n\n\n\n\n
- \ngetElementsByClassName<\/strong>\nSelects elements by their class name (returns a collection).\n<\/li>\n<\/ol>\n\n
const paragraphs = document.getElementsByClassName(\"description\");\n console.log(paragraphs[0].innerText);\n<\/pre>\n\n\n\n\n
- \ngetElementsByTagName<\/strong>\nSelects elements by their tag name (e.g., div, p).\n<\/li>\n<\/ol>\n\n
const headings = document.getElementsByTagName(\"h1\");\n console.log(headings[0].innerText);\n<\/pre>\n\n\n\n\n
- \nquerySelector<\/strong>\nSelects the first element matching a CSS selector.\n<\/li>\n<\/ol>\n\n
const title = document.querySelector(\"#title\");\n<\/pre>\n\n\n\n\n
- \nquerySelectorAll<\/strong>\nSelects all elements matching a CSS selector (returns a NodeList).\n<\/li>\n<\/ol>\n\n
const paragraphs = document.querySelectorAll(\".description\");\n<\/pre>\n\n\n\n\n
\n\n\n \n \n DOM Manipulation<\/strong>\n<\/h3>\n\n
Once selected, you can modify elements, attributes, and content dynamically.<\/p>\n\n
\n \n \n 1. Changing Content<\/strong>\n<\/h4>\n\n<\/pre>\n
\n
- \ninnerHTML<\/strong>: Sets or gets HTML content.\n<\/li>\n<\/ul>\n\n
document.getElementById(\"title\").innerHTML = \"Welcome to the DOM!\";\n<\/pre>\n\n\n\n\n
- \ninnerText<\/strong> or textContent<\/strong>: Sets or gets plain text.\n<\/li>\n<\/ul>\n\n
document.getElementById(\"title\").innerText = \"Hello, World!\";\n<\/pre>\n\n\n\n\n \n \n 2. Changing Attributes<\/strong>\n<\/h4>\n\n
\n
- Use setAttribute and getAttribute to modify element attributes.\n<\/li>\n<\/ul>\n\n
const link = document.querySelector(\"a\");\n link.setAttribute(\"href\", \"https:\/\/example.com\");\n<\/pre>\n\n\n\n\n
- Directly modify attributes like id, className, or src.\n<\/li>\n<\/ul>\n\n
const image = document.querySelector(\"img\");\n image.src = \"image.jpg\";\n<\/pre>\n\n\n\n\n \n \n 3. Changing Styles<\/strong>\n<\/h4>\n\n
Modify CSS properties directly.
\n<\/p>\n\n\n \nDOM Example<\/title>\n <\/head>\n <body> <h1><a href="http://ipnx.cn/">亚洲国产日韩欧美一区二区三区,精品亚洲国产成人av在线,国产99视频精品免视看7,99国产精品久久久久久久成人热,欧美日韩亚洲国产综合乱</a></h1>\n <h1>\n\n\n\n<p>The DOM represents it as:<br>\n<\/p>\n\n<pre>- Document\n - html\n - head\n - title\n - body\n - h1\n - p\n<\/pre>\n\n\n\n\n<hr>\n\n<h3>\n \n \n <strong>Adding and Removing Elements<\/strong>\n<\/h3>\n\n<h4>\n \n \n <strong>1. Adding Elements<\/strong>\n<\/h4>\n\n<\/pre>\n<ul>\n<li>\n<strong>createElement<\/strong>: Creates a new element.\n<\/li>\n<li>\n<strong>appendChild<\/strong>: Appends an element to a parent.\n<\/li>\n<\/ul>\n\n<pre> const title = document.getElementById(\"title\");\n console.log(title.innerText); \/\/ Output: Hello, DOM!\n<\/pre>\n\n\n\n<h4>\n \n \n <strong>2. Removing Elements<\/strong>\n<\/h4>\n\n<ul>\n<li>\n<strong>removeChild<\/strong>: Removes a child element.\n<\/li>\n<\/ul>\n\n<pre> const paragraphs = document.getElementsByClassName(\"description\");\n console.log(paragraphs[0].innerText);\n<\/pre>\n\n\n\n\n<hr>\n\n<h3>\n \n \n <strong>Event Handling in the DOM<\/strong>\n<\/h3>\n\n<p>Events are actions or occurrences detected by the browser, such as clicks or key presses. <\/p>\n\n<h4>\n \n \n <strong>Adding Event Listeners<\/strong>\n<\/h4>\n\n<p>Use addEventListener to bind events to elements.<br>\n<\/p>\n\n<pre> const headings = document.getElementsByTagName(\"h1\");\n console.log(headings[0].innerText);\n<\/pre>\n\n\n\n<h4>\n \n \n <strong>Common Events<\/strong>\n<\/h4>\n\n<ol>\n<li>\n<strong>Mouse Events<\/strong>: click, dblclick, mouseover, mouseout\n<\/li>\n<li>\n<strong>Keyboard Events<\/strong>: keydown, keyup\n<\/li>\n<li>\n<strong>Form Events<\/strong>: submit, change, focus\n<\/li>\n<\/ol>\n\n\n<hr>\n\n<h3>\n \n \n <strong>Traversing the DOM<\/strong>\n<\/h3>\n\n<p>You can navigate between elements using relationships in the DOM tree.<\/p>\n\n<h4>\n \n \n <strong>Parent and Children<\/strong>\n<\/h4>\n\n<ul>\n<li>\n<strong>parentNode<\/strong>: Gets the parent node.\n<\/li>\n<li>\n<strong>childNodes<\/strong>: Lists all child nodes.\n<\/li>\n<li>\n<strong>children<\/strong>: Lists all child elements.\n<\/li>\n<\/ul>\n\n<pre> const title = document.querySelector(\"#title\");\n<\/pre>\n\n\n\n<h4>\n \n \n <strong>Siblings<\/strong>\n<\/h4>\n\n<ul>\n<li>\n<strong>nextSibling<\/strong>: Gets the next sibling node.\n<\/li>\n<li>\n<strong>previousSibling<\/strong>: Gets the previous sibling node.\n<\/li>\n<\/ul>\n\n\n<hr>\n\n<h3>\n \n \n <strong>Advanced DOM Features<\/strong>\n<\/h3>\n\n<h4>\n \n \n <strong>1. Cloning Elements<\/strong>\n<\/h4>\n\n<p>Create a duplicate of an element using cloneNode.<br>\n<\/p>\n\n<pre> const paragraphs = document.querySelectorAll(\".description\");\n<\/pre>\n\n\n\n<h4>\n \n \n <strong>2. Working with Classes<\/strong>\n<\/h4>\n\n<p>Use the classList property to manipulate classes.<br>\n<\/p>\n\n<pre> document.getElementById(\"title\").innerHTML = \"Welcome to the DOM!\";\n<\/pre>\n\n\n\n<h4>\n \n \n <strong>3. Using Templates<\/strong>\n<\/h4>\n\n<p>HTML templates allow reusable content.<br>\n<\/p>\n\n<pre> document.getElementById(\"title\").innerText = \"Hello, World!\";\n<\/pre>\n\n\n\n\n<hr>\n\n<h3>\n \n \n <strong>Best Practices for DOM Manipulation<\/strong>\n<\/h3>\n\n<ol>\n<li>\n<p><strong>Minimize Reflows and Repaints<\/strong>: <\/p>\n\n<ul>\n<li>Batch DOM changes to avoid excessive rendering.\n<\/li>\n<li>Use documentFragment for multiple updates.\n<\/li>\n<\/ul>\n<\/li>\n<li><p><strong>Use Event Delegation<\/strong>:<br><br>\nAttach events to parent elements instead of individual child elements.<br>\n<\/p><\/li>\n<\/ol>\n\n<pre><!DOCTYPE html>\n<html>\n <head>\n <title>DOM Example<\/title>\n <\/head>\n <body>\n <h1>\n\n\n\n<p>The DOM represents it as:<br>\n<\/p>\n\n<pre>- Document\n - html\n - head\n - title\n - body\n - h1\n - p\n<\/pre>\n\n\n\n<ol>\n<li>\n<strong>Avoid Inline JavaScript<\/strong>:\nUse external scripts or addEventListener for clean separation of code.<\/li>\n<\/ol>\n\n\n<hr>\n\n<h3>\n \n \n <strong>Conclusion<\/strong>\n<\/h3>\n\n<p>The JavaScript HTML DOM is a powerful tool for creating dynamic and interactive web pages. By mastering DOM manipulation, event handling, and best practices, developers can build responsive and user-friendly applications that enhance the overall user experience.<\/p>\n\n<p><strong>Hi, I'm Abhay Singh Kathayat!<\/strong><br>\nI am a full-stack developer with expertise in both front-end and back-end technologies. I work with a variety of programming languages and frameworks to build efficient, scalable, and user-friendly applications.<br>\nFeel free to reach out to me at my business email: kaashshorts28@gmail.com.<\/p>\n\n\n \n\n \n <\/pre>"} </script> <meta http-equiv="Cache-Control" content="no-transform" /> <meta http-equiv="Cache-Control" content="no-siteapp" /> <script>var V_PATH="/";window.onerror=function(){ return true; };</script> </head> <body data-commit-time="2023-12-28T14:50:12+08:00" class="editor_body body2_2"> <link rel="stylesheet" type="text/css" href="/static/csshw/stylehw.css"> <header> <div id="wjcelcm34c" class="head"> <div id="wjcelcm34c" class="haed_left"> <div id="wjcelcm34c" class="haed_logo"> <a href="http://ipnx.cn/" title="" class="haed_logo_a"> <img src="/static/imghw/logo.png" alt="" class="haed_logoimg"> </a> </div> <div id="wjcelcm34c" class="head_nav"> <div id="wjcelcm34c" class="head_navs"> <a href="javascript:;" title="Community" class="head_nava 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HTML DOM: Building Dynamic and Interactive Webpages</span> </div> <div id="wjcelcm34c" class="Articlelist_txts"> <div id="wjcelcm34c" class="Articlelist_txts_info"> <h1 class="Articlelist_txts_title">Mastering the JavaScript HTML DOM: Building Dynamic and Interactive Webpages</h1> <div id="wjcelcm34c" class="Articlelist_txts_info_head"> <div id="wjcelcm34c" class="author_info"> <a href="http://ipnx.cn/member/1468492.html" class="author_avatar"> <img class="lazy" data-src="https://img.php.cn/upload/avatar/000/000/001/66ea8147b1057383.png" src="/static/imghw/default1.png" alt="Mary-Kate Olsen"> </a> <div id="wjcelcm34c" class="author_detail"> <a href="http://ipnx.cn/member/1468492.html" class="author_name">Mary-Kate Olsen</a> </div> </div> </div> <span id="wjcelcm34c" class="Articlelist_txts_time">Dec 20, 2024 am 02:57 AM</span> </div> </div> <hr /> <div id="wjcelcm34c" class="article_main php-article"> <div id="wjcelcm34c" class="article-list-left detail-content-wrap content"> <ins class="adsbygoogle" style="display:block; text-align:center;" data-ad-layout="in-article" data-ad-format="fluid" data-ad-client="ca-pub-5902227090019525" data-ad-slot="3461856641"> </ins> <p><img src="/static/imghw/default1.png" data-src="https://img.php.cn/upload/article/000/000/000/173463463582725.jpg" class="lazy" alt="Mastering the JavaScript HTML DOM: Building Dynamic and Interactive Webpages"></p> <h3> <strong>JavaScript HTML DOM: A Complete Guide</strong> </h3> <p>The <strong>Document Object Model (DOM)</strong> is a programming interface for web documents. It represents the structure of a webpage as a tree of objects, enabling developers to manipulate HTML and CSS using JavaScript. By mastering DOM, you can create dynamic, interactive web pages.</p> <hr> <h3> <strong>What is the DOM?</strong> </h3> <p>The DOM is a structured representation of an HTML document. It allows JavaScript to access and manipulate the elements, attributes, and content of a webpage dynamically. </p> <h4> Example: </h4> <p>For this HTML:<br> </p> <pre class="brush:php;toolbar:false"><!DOCTYPE html> <html> <head> <title>DOM Example</title> </head> <body> <h1> <p>The DOM represents it as:<br> </p> <pre class="brush:php;toolbar:false">- Document - html - head - title - body - h1 - p </pre> <hr> <h3> <strong>Accessing the DOM</strong> </h3> <p>JavaScript provides methods to select and manipulate DOM elements. </p> <h4> <strong>Common Selection Methods</strong> </h4> <ol> <li> <strong>getElementById</strong> Selects an element by its ID. </li> </ol> <pre class="brush:php;toolbar:false"> const title = document.getElementById("title"); console.log(title.innerText); // Output: Hello, DOM! </pre> <ol> <li> <strong>getElementsByClassName</strong> Selects elements by their class name (returns a collection). </li> </ol> <pre class="brush:php;toolbar:false"> const paragraphs = document.getElementsByClassName("description"); console.log(paragraphs[0].innerText); </pre> <ol> <li> <strong>getElementsByTagName</strong> Selects elements by their tag name (e.g., div, p). </li> </ol> <pre class="brush:php;toolbar:false"> const headings = document.getElementsByTagName("h1"); console.log(headings[0].innerText); </pre> <ol> <li> <strong>querySelector</strong> Selects the first element matching a CSS selector. </li> </ol> <pre class="brush:php;toolbar:false"> const title = document.querySelector("#title"); </pre> <ol> <li> <strong>querySelectorAll</strong> Selects all elements matching a CSS selector (returns a NodeList). </li> </ol> <pre class="brush:php;toolbar:false"> const paragraphs = document.querySelectorAll(".description"); </pre> <hr> <h3> <strong>DOM Manipulation</strong> </h3> <p>Once selected, you can modify elements, attributes, and content dynamically.</p> <h4> <strong>1. Changing Content</strong> </h4> </pre> <ul> <li> <strong>innerHTML</strong>: Sets or gets HTML content. </li> </ul> <pre class="brush:php;toolbar:false"> document.getElementById("title").innerHTML = "Welcome to the DOM!"; </pre> <ul> <li> <strong>innerText</strong> or <strong>textContent</strong>: Sets or gets plain text. </li> </ul> <pre class="brush:php;toolbar:false"> document.getElementById("title").innerText = "Hello, World!"; </pre> <h4> <strong>2. Changing Attributes</strong> </h4> <ul> <li>Use setAttribute and getAttribute to modify element attributes. </li> </ul> <pre class="brush:php;toolbar:false"> const link = document.querySelector("a"); link.setAttribute("href", "https://example.com"); </pre> <ul> <li>Directly modify attributes like id, className, or src. </li> </ul> <pre class="brush:php;toolbar:false"> const image = document.querySelector("img"); image.src = "image.jpg"; </pre> <h4> <strong>3. Changing Styles</strong> </h4> <p>Modify CSS properties directly.<br> </p> <pre class="brush:php;toolbar:false"><!DOCTYPE html> <html> <head> <title>DOM Example</title> </head> <body> <h1> <p>The DOM represents it as:<br> </p> <pre class="brush:php;toolbar:false">- Document - html - head - title - body - h1 - p </pre> <hr> <h3> <strong>Adding and Removing Elements</strong> </h3> <h4> <strong>1. Adding Elements</strong> </h4> </pre> <ul> <li> <strong>createElement</strong>: Creates a new element. </li> <li> <strong>appendChild</strong>: Appends an element to a parent. </li> </ul> <pre class="brush:php;toolbar:false"> const title = document.getElementById("title"); console.log(title.innerText); // Output: Hello, DOM! </pre> <h4> <strong>2. Removing Elements</strong> </h4> <ul> <li> <strong>removeChild</strong>: Removes a child element. </li> </ul> <pre class="brush:php;toolbar:false"> const paragraphs = document.getElementsByClassName("description"); console.log(paragraphs[0].innerText); </pre> <hr> <h3> <strong>Event Handling in the DOM</strong> </h3> <p>Events are actions or occurrences detected by the browser, such as clicks or key presses. </p> <h4> <strong>Adding Event Listeners</strong> </h4> <p>Use addEventListener to bind events to elements.<br> </p> <pre class="brush:php;toolbar:false"> const headings = document.getElementsByTagName("h1"); console.log(headings[0].innerText); </pre> <h4> <strong>Common Events</strong> </h4> <ol> <li> <strong>Mouse Events</strong>: click, dblclick, mouseover, mouseout </li> <li> <strong>Keyboard Events</strong>: keydown, keyup </li> <li> <strong>Form Events</strong>: submit, change, focus </li> </ol> <hr> <h3> <strong>Traversing the DOM</strong> </h3> <p>You can navigate between elements using relationships in the DOM tree.</p> <h4> <strong>Parent and Children</strong> </h4> <ul> <li> <strong>parentNode</strong>: Gets the parent node. </li> <li> <strong>childNodes</strong>: Lists all child nodes. </li> <li> <strong>children</strong>: Lists all child elements. </li> </ul> <pre class="brush:php;toolbar:false"> const title = document.querySelector("#title"); </pre> <h4> <strong>Siblings</strong> </h4> <ul> <li> <strong>nextSibling</strong>: Gets the next sibling node. </li> <li> <strong>previousSibling</strong>: Gets the previous sibling node. </li> </ul> <hr> <h3> <strong>Advanced DOM Features</strong> </h3> <h4> <strong>1. Cloning Elements</strong> </h4> <p>Create a duplicate of an element using cloneNode.<br> </p> <pre class="brush:php;toolbar:false"> const paragraphs = document.querySelectorAll(".description"); </pre> <h4> <strong>2. Working with Classes</strong> </h4> <p>Use the classList property to manipulate classes.<br> </p> <pre class="brush:php;toolbar:false"> document.getElementById("title").innerHTML = "Welcome to the DOM!"; </pre> <h4> <strong>3. Using Templates</strong> </h4> <p>HTML templates allow reusable content.<br> </p> <pre class="brush:php;toolbar:false"> document.getElementById("title").innerText = "Hello, World!"; </pre> <hr> <h3> <strong>Best Practices for DOM Manipulation</strong> </h3> <ol> <li> <p><strong>Minimize Reflows and Repaints</strong>: </p> <ul> <li>Batch DOM changes to avoid excessive rendering. </li> <li>Use documentFragment for multiple updates. </li> </ul> </li> <li><p><strong>Use Event Delegation</strong>:<br><br> Attach events to parent elements instead of individual child elements.<br> </p></li> </ol> <pre class="brush:php;toolbar:false"><!DOCTYPE html> <html> <head> <title>DOM Example</title> </head> <body> <h1> <p>The DOM represents it as:<br> </p> <pre class="brush:php;toolbar:false">- Document - html - head - title - body - h1 - p </pre> <ol> <li> <strong>Avoid Inline JavaScript</strong>: Use external scripts or addEventListener for clean separation of code.</li> </ol> <hr> <h3> <strong>Conclusion</strong> </h3> <p>The JavaScript HTML DOM is a powerful tool for creating dynamic and interactive web pages. By mastering DOM manipulation, event handling, and best practices, developers can build responsive and user-friendly applications that enhance the overall user experience.</p> <p><strong>Hi, I'm Abhay Singh Kathayat!</strong><br> I am a full-stack developer with expertise in both front-end and back-end technologies. I work with a variety of programming languages and frameworks to build efficient, scalable, and user-friendly applications.<br> Feel free to reach out to me at my business email: kaashshorts28@gmail.com.</p> </pre><p>The above is the detailed content of Mastering the JavaScript HTML DOM: Building Dynamic and Interactive Webpages. For more information, please follow other related articles on the PHP Chinese website!</p> </div> </div> <div id="wjcelcm34c" class="wzconShengming_sp"> <div id="wjcelcm34c" class="bzsmdiv_sp">Statement of this Website</div> <div>The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. 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It has concise syntax and powerful functions, supports async/await, automatic JSON conversion, interceptor, etc. It is recommended to simplify asynchronous request operations; 3.node-fetch provides a style similar to browser fetch, based on Promise and simple syntax</p> </div> <div id="wjcelcm34c" class="phphistorical_Version2_mids"> <a href="http://ipnx.cn/faq/1796836292.html" title="JavaScript Data Types: Primitive vs Reference" class="phphistorical_Version2_mids_img"> <img onerror="this.onerror=''; this.src='/static/imghw/default1.png'" src="/static/imghw/default1.png" class="lazy" data-src="https://img.php.cn/upload/article/001/431/639/175234579081669.jpg?x-oss-process=image/resize,m_fill,h_207,w_330" alt="JavaScript Data Types: Primitive vs Reference" /> </a> <a href="http://ipnx.cn/faq/1796836292.html" title="JavaScript Data Types: Primitive vs Reference" class="phphistorical_Version2_mids_title">JavaScript Data Types: Primitive vs Reference</a> <span id="wjcelcm34c" class="Articlelist_txts_time">Jul 13, 2025 am 02:43 AM</span> <p class="Articlelist_txts_p">JavaScript data types are divided into primitive types and reference types. Primitive types include string, number, boolean, null, undefined, and symbol. The values are immutable and copies are copied when assigning values, so they do not affect each other; reference types such as objects, arrays and functions store memory addresses, and variables pointing to the same object will affect each other. Typeof and instanceof can be used to determine types, but pay attention to the historical issues of typeofnull. Understanding these two types of differences can help write more stable and reliable code.</p> </div> <div id="wjcelcm34c" class="phphistorical_Version2_mids"> <a href="http://ipnx.cn/faq/1796832745.html" title="JavaScript time object, someone builds an eactexe, faster website on Google Chrome, etc." class="phphistorical_Version2_mids_img"> <img onerror="this.onerror=''; this.src='/static/imghw/default1.png'" src="/static/imghw/default1.png" class="lazy" data-src="https://img.php.cn/upload/article/001/246/273/173914572643912.jpg?x-oss-process=image/resize,m_fill,h_207,w_330" alt="JavaScript time object, someone builds an eactexe, faster website on Google Chrome, etc." /> </a> <a href="http://ipnx.cn/faq/1796832745.html" title="JavaScript time object, someone builds an eactexe, faster website on Google Chrome, etc." class="phphistorical_Version2_mids_title">JavaScript time object, someone builds an eactexe, faster website on Google Chrome, etc.</a> <span id="wjcelcm34c" class="Articlelist_txts_time">Jul 08, 2025 pm 02:27 PM</span> <p class="Articlelist_txts_p">Hello, JavaScript developers! Welcome to this week's JavaScript news! This week we will focus on: Oracle's trademark dispute with Deno, new JavaScript time objects are supported by browsers, Google Chrome updates, and some powerful developer tools. Let's get started! Oracle's trademark dispute with Deno Oracle's attempt to register a "JavaScript" trademark has caused controversy. Ryan Dahl, the creator of Node.js and Deno, has filed a petition to cancel the trademark, and he believes that JavaScript is an open standard and should not be used by Oracle</p> </div> <div id="wjcelcm34c" class="phphistorical_Version2_mids"> <a href="http://ipnx.cn/faq/1796830657.html" title="React vs Angular vs Vue: which js framework is best?" class="phphistorical_Version2_mids_img"> <img onerror="this.onerror=''; this.src='/static/imghw/default1.png'" src="/static/imghw/default1.png" class="lazy" data-src="https://img.php.cn/upload/article/001/431/639/175165349052637.jpg?x-oss-process=image/resize,m_fill,h_207,w_330" alt="React vs Angular vs Vue: which js framework is best?" /> </a> <a href="http://ipnx.cn/faq/1796830657.html" title="React vs Angular vs Vue: which js framework is best?" class="phphistorical_Version2_mids_title">React vs Angular vs Vue: which js framework is best?</a> <span id="wjcelcm34c" class="Articlelist_txts_time">Jul 05, 2025 am 02:24 AM</span> <p class="Articlelist_txts_p">Which JavaScript framework is the best choice? The answer is to choose the most suitable one according to your needs. 1.React is flexible and free, suitable for medium and large projects that require high customization and team architecture capabilities; 2. Angular provides complete solutions, suitable for enterprise-level applications and long-term maintenance; 3. Vue is easy to use, suitable for small and medium-sized projects or rapid development. In addition, whether there is an existing technology stack, team size, project life cycle and whether SSR is needed are also important factors in choosing a framework. In short, there is no absolutely the best framework, the best choice is the one that suits your needs.</p> </div> <div id="wjcelcm34c" class="phphistorical_Version2_mids"> <a href="http://ipnx.cn/faq/1796829862.html" title="Understanding Immediately Invoked Function Expressions (IIFE) in JavaScript" class="phphistorical_Version2_mids_img"> <img onerror="this.onerror=''; this.src='/static/imghw/default1.png'" src="/static/imghw/default1.png" class="lazy" data-src="https://img.php.cn/upload/article/001/253/068/175156814092778.jpg?x-oss-process=image/resize,m_fill,h_207,w_330" alt="Understanding Immediately Invoked Function Expressions (IIFE) in JavaScript" /> </a> <a href="http://ipnx.cn/faq/1796829862.html" title="Understanding Immediately Invoked Function Expressions (IIFE) in JavaScript" class="phphistorical_Version2_mids_title">Understanding Immediately Invoked Function Expressions (IIFE) in JavaScript</a> <span id="wjcelcm34c" class="Articlelist_txts_time">Jul 04, 2025 am 02:42 AM</span> <p class="Articlelist_txts_p">IIFE (ImmediatelyInvokedFunctionExpression) is a function expression executed immediately after definition, used to isolate variables and avoid contaminating global scope. It is called by wrapping the function in parentheses to make it an expression and a pair of brackets immediately followed by it, such as (function(){/code/})();. Its core uses include: 1. Avoid variable conflicts and prevent duplication of naming between multiple scripts; 2. Create a private scope to make the internal variables invisible; 3. Modular code to facilitate initialization without exposing too many variables. Common writing methods include versions passed with parameters and versions of ES6 arrow function, but note that expressions and ties must be used.</p> </div> <div id="wjcelcm34c" class="phphistorical_Version2_mids"> <a href="http://ipnx.cn/faq/1796832608.html" title="Handling Promises: Chaining, Error Handling, and Promise Combinators in JavaScript" class="phphistorical_Version2_mids_img"> <img onerror="this.onerror=''; this.src='/static/imghw/default1.png'" src="/static/imghw/default1.png" class="lazy" data-src="https://img.php.cn/upload/article/001/253/068/175191360175213.jpg?x-oss-process=image/resize,m_fill,h_207,w_330" alt="Handling Promises: Chaining, Error Handling, and Promise Combinators in JavaScript" /> </a> <a href="http://ipnx.cn/faq/1796832608.html" title="Handling Promises: Chaining, Error Handling, and Promise Combinators in JavaScript" class="phphistorical_Version2_mids_title">Handling Promises: Chaining, Error Handling, and Promise Combinators in JavaScript</a> <span id="wjcelcm34c" class="Articlelist_txts_time">Jul 08, 2025 am 02:40 AM</span> <p class="Articlelist_txts_p">Promise is the core mechanism for handling asynchronous operations in JavaScript. Understanding chain calls, error handling and combiners is the key to mastering their applications. 1. The chain call returns a new Promise through .then() to realize asynchronous process concatenation. Each .then() receives the previous result and can return a value or a Promise; 2. Error handling should use .catch() to catch exceptions to avoid silent failures, and can return the default value in catch to continue the process; 3. Combinators such as Promise.all() (successfully successful only after all success), Promise.race() (the first completion is returned) and Promise.allSettled() (waiting for all completions)</p> </div> <div id="wjcelcm34c" class="phphistorical_Version2_mids"> <a href="http://ipnx.cn/faq/1796832618.html" title="What is the cache API and how is it used with Service Workers?" class="phphistorical_Version2_mids_img"> <img onerror="this.onerror=''; this.src='/static/imghw/default1.png'" src="/static/imghw/default1.png" class="lazy" data-src="https://img.php.cn/upload/article/001/253/068/175191380054750.jpg?x-oss-process=image/resize,m_fill,h_207,w_330" alt="What is the cache API and how is it used with Service Workers?" /> </a> <a href="http://ipnx.cn/faq/1796832618.html" title="What is the cache API and how is it used with Service Workers?" class="phphistorical_Version2_mids_title">What is the cache API and how is it used with Service Workers?</a> <span id="wjcelcm34c" class="Articlelist_txts_time">Jul 08, 2025 am 02:43 AM</span> <p class="Articlelist_txts_p">CacheAPI is a tool provided by the browser to cache network requests, which is often used in conjunction with ServiceWorker to improve website performance and offline experience. 1. It allows developers to manually store resources such as scripts, style sheets, pictures, etc.; 2. It can match cache responses according to requests; 3. It supports deleting specific caches or clearing the entire cache; 4. It can implement cache priority or network priority strategies through ServiceWorker listening to fetch events; 5. It is often used for offline support, speed up repeated access speed, preloading key resources and background update content; 6. When using it, you need to pay attention to cache version control, storage restrictions and the difference from HTTP caching mechanism.</p> </div> </div> <a href="http://ipnx.cn/web-designer.html" class="phpgenera_Details_mainL4_botton"> <span>See all articles</span> <img src="/static/imghw/down_right.png" alt="" /> </a> </div> </div> </div> </main> <footer> <div id="wjcelcm34c" class="footer"> <div id="wjcelcm34c" class="footertop"> <img src="/static/imghw/logo.png" alt=""> <p>Public welfare online PHP training，Help PHP learners grow quickly！</p> </div> <div id="wjcelcm34c" class="footermid"> <a href="http://ipnx.cn/about/us.html">About us</a> <a href="http://ipnx.cn/about/disclaimer.html">Disclaimer</a> <a href="http://ipnx.cn/update/article_0_1.html">Sitemap</a> </div> <div id="wjcelcm34c" class="footerbottom"> <p> ? php.cn All rights reserved </p> </div> </div> </footer> <input type="hidden" id="verifycode" value="/captcha.html"> <link rel='stylesheet' id='_main-css' href='/static/css/viewer.min.css?2' type='text/css' media='all' /> <footer> <div class="friendship-link"> <p>感谢您访问我们的网站，您可能还对以下资源感兴趣：</p> <a href="http://ipnx.cn/" title="亚洲国产日韩欧美一区二区三区">亚洲国产日韩欧美一区二区三区</a> <div class="friend-links"> </div> </div> </footer> <script> (function(){ var bp = document.createElement('script'); 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