Explanation:<\/p>\n\n<\/pre>\n
Button Click Example
\nYou can make a button do something when clicked.
\n<\/p>\n\n
\n\n\nClick 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 <button>\n\n\n\n<p>What Happens:<\/p>\n\n<\/pre>\n<ul>\n<li>The button listens for a “click.”<\/li>\n<li> When clicked, JavaScript updates the <p> tag with a message.<\/p>\n<\/li>\n<\/ul>\n\n<p>Simple Calculator<br>\n Let’s create a calculator for adding two numbers.<br>\n<\/p>\n\n<pre><!DOCTYPE html>\n<html lang=\"en\">\n<head>\n <title>Simple Calculator<\/title>\n<\/head>\n<body>\n <input type=\"number\">\n\n\n\n<p>How It Works:<\/p>\n\n<\/pre>\n<ul>\n<li>The user enters numbers in two input fields.<\/li>\n<li>When the “Add” button is clicked, JavaScript calculates the sum and displays it.<\/li>\n<\/ul>\n\n<h2>\n \n \n Key Concepts in JavaScript\n<\/h2>\n\n<p><strong>Variables:<\/strong><br>\n Variables store data that can be used later.<\/p>\n\n<p><strong>Why Use Variables?<\/strong><\/p>\n\n<p>Variables help you:<\/p>\n\n<ul>\n<li>Store Information: Keep data in memory for later use.<\/li>\n<li>Reuse Values: Avoid rewriting the same value multiple times.<\/li>\n<li>Make Code Dynamic: Change variable values to alter program behavior.\n<\/li>\n<\/ul>\n<pre>let name = \"John\"; \/\/ Storing the value \"John\" in a variable called name\nconsole.log(name); \/\/ Outputs: John\n<\/pre>\n\n\n<p><strong>Functions:<\/strong><br>\n In JavaScript, functions are reusable blocks of code designed to <br>\n perform a specific task. They allow you to write a piece of logic <br>\n once and use it multiple times, making your code more efficient and <br>\n organized.<br>\n<\/p>\n\n<pre>function greet(name) {\n return \"Hello, \" + name;\n}\n\nconsole.log(greet(\"Alice\")); \/\/ Output: Hello, Alice\nconsole.log(greet(\"Bob\")); \/\/ Output: Hello, Bob\n<\/pre>\n\n\n\n<p>*<em>Events: *<\/em><br>\n Events in JavaScript are actions or occurrences that happen in the browser, often triggered by the user (e.g., clicking a button, typing in an input field, or resizing the window). JavaScript can “l(fā)isten” for these events and perform specific actions in response. This is a key concept for creating interactive and dynamic web pages.<br>\n<\/p>\n<pre><!DOCTYPE html>\n<html lang=\"en\">\n<head>\n <title>JavaScript Example<\/title>\n<\/head>\n<body>\n <h1>\n\n\n\n<p>Explanation:<\/p>\n\n<\/pre>\n<ul>\n<li>The getElementById(\"heading\") selects the 'h1' element.<\/li>\n<li>.innerText = \"Hello, JavaScript!\"; changes its text.<\/li>\n<\/ul>\n\n<p>Button Click Example<br>\nYou can make a button do something when clicked.<br>\n<\/p>\n\n<pre><!DOCTYPE html>\n<html lang=\"en\">\n<head>\n <title>Click Example<\/title>\n<\/head>\n<body>\n <button>\n\n\n\n<p>What Happens:<\/p>\n\n<\/pre>\n<ul>\n<li>The button listens for a “click.”<\/li>\n<li> When clicked, JavaScript updates the <p> tag with a message.<\/p>\n<\/li>\n<\/ul>\n\n<p>Simple Calculator<br>\n Let’s create a calculator for adding two numbers.<br>\n<\/p>\n\n<pre><!DOCTYPE html>\n<html lang=\"en\">\n<head>\n <title>Simple Calculator<\/title>\n<\/head>\n<body>\n <input type=\"number\">\n\n\n\n<p>How It Works:<\/p>\n\n<ul>\n<li>The user enters numbers in two input fields.<\/li>\n<li>When the “Add” button is clicked, JavaScript calculates the sum and displays it.<\/li>\n<\/ul>\n\n<h2>\n \n \n Key Concepts in JavaScript\n<\/h2>\n\n<p><strong>Variables:<\/strong><br>\n Variables store data that can be used later.<\/p>\n\n<p><strong>Why Use Variables?<\/strong><\/p>\n\n<p>Variables help you:<\/p>\n\n<ul>\n<li>Store Information: Keep data in memory for later use.<\/li>\n<li>Reuse Values: Avoid rewriting the same value multiple times.<\/li>\n<li>Make Code Dynamic: Change variable values to alter program behavior.\n<\/li>\n<\/ul>\n<pre>let name = \"John\"; \/\/ Storing the value \"John\" in a variable called name\nconsole.log(name); \/\/ Outputs: John\n<\/pre>\n\n\n<p><strong>Loops:<\/strong><br>\n In JavaScript, loops are used to repeat a block of code multiple times. They are helpful when you want to perform an action or series of actions several times, such as iterating over items in an array or performing a task until a condition is met.<\/p>\n\n<p>There are several types of loops in JavaScript, each useful for different situations. Let’s go over the most common ones<\/p>\n\n<ul>\n<li>for Loop:<\/li>\n<\/ul>\n\n<p>The for loop is the most basic loop. It repeats a block of code for a specified number of times.<br>\n<\/p>\n\n<pre>function greet(name) {\n return \"Hello, \" + name;\n}\n\nconsole.log(greet(\"Alice\")); \/\/ Output: Hello, Alice\nconsole.log(greet(\"Bob\")); \/\/ Output: Hello, Bob\n<\/pre>\n\n\n\n<ul>\n<li>while Loop:<\/li>\n<\/ul>\n\n<p>The while loop runs as long as a specified condition is true. It checks the condition before each iteration.<br>\n<\/p>\n\n<pre><button>\n\n\n\n<p><strong>Conditions:<\/strong><br>\n In JavaScript, conditions are used to perform different actions <br>\n based on whether a specified condition evaluates to true or false. <br>\n This helps control the flow of your program, allowing it to make <br>\n decisions.<\/p>\n\n<p>Why Use Conditions?<\/p>\n\n<ul>\n<li>Decision Making: Execute code based on specific situations.<\/li>\n<li>Dynamic Behavior: React to user input or external data.<\/li>\n<li>Error Handling: Handle unexpected cases gracefully.\n<\/li>\n<\/ul>\n<pre>let age = 20;\n\nif (age >= 18) {\n console.log(\"You are an adult.\");\n} else {\n console.log(\"You are not an adult.\");\n}\n<\/pre>\n\n\n\n<ul>\n<li>do...while Loop:<\/li>\n<\/ul>\n\n<p>The do...while loop is similar to the while loop, but it guarantees that the code will run at least once, even if the condition is false initially. It checks the condition after each iteration.<br>\n<\/p>\n\n<pre>\/\/ Print numbers 1 to 5\nfor (let i = 1; i <= 5; i++) {\n console.log(i);\n}\n\/\/ Output: 1, 2, 3, 4, 5\n<\/pre>\n\n\n\n<ul>\n<li>for...in Loop:<\/li>\n<\/ul>\n\n<p>The for...in loop is used to iterate over the properties of an object (keys).<br>\n<\/p>\n\n<pre>\/\/ Print numbers 1 to 5 using a while loop\nlet i = 1;\nwhile (i <= 5) {\n console.log(i);\n i++; \/\/ Don't forget to increment i!\n}\n\/\/ Output: 1, 2, 3, 4, 5\n<\/pre>\n\n\n\n<ul>\n<li>for...of Loop:<\/li>\n<\/ul>\n\n<p>The for...of loop is used to iterate over the values in an iterable object (like an array, string, or other iterable objects).<br>\n<\/p>\n\n<pre>\/\/ Print numbers 1 to 5 using do...while loop\nlet i = 1;\ndo {\n console.log(i);\n i++;\n} while (i <= 5);\n\/\/ Output: 1, 2, 3, 4, 5\n<\/pre>\n\n\n\n<h2>\n \n \n Where JavaScript is Used\n<\/h2>\n\n<ol>\n<li>Frontend Development:\nJavaScript frameworks like React, Angular, and Vue.js are used to \nbuild interactive websites.<\/li>\n<li>Backend Development:\nNode.js allows JavaScript to run on servers, powering backend logic.<\/li>\n<li>APIs:\nJavaScript fetches data from remote servers.<\/li>\n<\/ol>\n\n<h2>\n \n \n Why Learn JavaScript?\n<\/h2>\n\n<ul>\n<li>Widely Used: Almost every website uses JavaScript.<\/li>\n<li>Career Opportunities: Essential for web developers.<\/li>\n<li>Easy to Start: You only need a browser to write and test JavaScript.<\/li>\n<\/ul>\n\n<h2>\n \n \n Conclusion\n<\/h2>\n\n<p>JavaScript is a beginner-friendly yet powerful programming language. <br>\n By practicing simple examples and understanding key concepts, you <br>\n can unlock the ability to create interactive and engaging web <br>\n applications!<\/p>\n\n\n \n\n \n "} </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 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class="Article_Details_main1"> <div id="wjcelcm34c" class="Article_Details_main1M"> <div id="wjcelcm34c" class="phpgenera_Details_mainL1"> <a href="http://ipnx.cn/" title="Home" class="phpgenera_Details_mainL1a">Home</a> <img src="/static/imghw/top_right.png" alt="" /> <a href="http://ipnx.cn/web-designer.html" class="phpgenera_Details_mainL1a">Web Front-end</a> <img src="/static/imghw/top_right.png" alt="" /> <a href="http://ipnx.cn/js-tutorial.html" class="phpgenera_Details_mainL1a">JS Tutorial</a> <img src="/static/imghw/top_right.png" alt="" /> <span>JavaScript and Its Core Concepts: A Beginner's Guide to Web Development</span> </div> <div id="wjcelcm34c" class="Articlelist_txts"> <div id="wjcelcm34c" class="Articlelist_txts_info"> <h1 class="Articlelist_txts_title">JavaScript and Its Core Concepts: A Beginner's Guide to Web Development</h1> <div id="wjcelcm34c" class="Articlelist_txts_info_head"> <div id="wjcelcm34c" class="author_info"> <a href="http://ipnx.cn/member/1468488.html" class="author_avatar"> <img class="lazy" data-src="https://img.php.cn/upload/avatar/000/000/001/66ea81ad58039131.png" src="/static/imghw/default1.png" alt="Susan Sarandon"> </a> <div id="wjcelcm34c" class="author_detail"> <a href="http://ipnx.cn/member/1468488.html" class="author_name">Susan Sarandon</a> </div> </div> </div> <span id="wjcelcm34c" class="Articlelist_txts_time">Dec 23, 2024 am 01:56 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/000/000/000/173489019817426.jpg" class="lazy" alt="JavaScript and Its Core Concepts: A Beginner’s Guide to Web Development"></p> <h2> What is JavaScript? </h2> <p>JavaScript is a programming language that helps make websites interactive and dynamic. While HTML is used to structure the content of a webpage, and CSS is used to style it, JavaScript adds functionality and allows the webpage to respond to user actions.</p> <p>For example:<br> ? You click a button, and something happens (like a menu opening).<br> ? You scroll, and content appears dynamically.<br> ? A form checks your input (like email validation) before submission.</p> <p><strong>Key Features of JavaScript (Simplified)</strong></p> <ol> <li>Runs in the Browser: JavaScript runs directly in browsers like Chrome, Firefox, or Safari, so it works without installing anything extra.</li> <li>Dynamic: You can change a webpage (its content or appearance) without reloading it.</li> <li>Interactive: It responds to events like clicks, mouse movements, or key presses.</li> <li>Fast: It works quickly because it runs directly in the browser.</li> <li>Works Everywhere: JavaScript is used both on the browser (frontend) and servers (backend, using Node.js).</li> </ol> <p><strong>How JavaScript Works (Simplified)</strong></p> <p>When you visit a webpage:</p> <ol> <li>JavaScript Loads: The browser loads the JavaScript file alongside HTML and CSS.</li> <li>Executes Code: The browser’s JavaScript engine (like V8 in Chrome) runs the JavaScript line by line.</li> <li>Interacts with the Page: JavaScript can access and change parts of the page, like:</li> </ol> <ul> <li>Adding or removing elements.</li> <li>Styling parts of the page dynamically.</li> <li>Showing or hiding content based on user actions.</li> </ul> <p><strong>Examples to Make It Clear</strong></p> <p>Changing Text on a Page<br> Let’s say you have a heading, and you want JavaScript to change its text.<br> </p> <pre class="brush:php;toolbar:false"><!DOCTYPE html> <html lang="en"> <head> <title>JavaScript Example</title> </head> <body> <h1> <p>Explanation:</p> </pre> <ul> <li>The getElementById("heading") selects the 'h1' element.</li> <li>.innerText = "Hello, JavaScript!"; changes its text.</li> </ul> <p>Button Click Example<br> You can make a button do something when clicked.<br> </p> <pre class="brush:php;toolbar:false"><!DOCTYPE html> <html lang="en"> <head> <title>Click Example</title> </head> <body> <button> <p>What Happens:</p> </pre> <ul> <li>The button listens for a “click.”</li> <li> When clicked, JavaScript updates the <p> tag with a message.</p> </li> </ul> <p>Simple Calculator<br> Let’s create a calculator for adding two numbers.<br> </p> <pre class="brush:php;toolbar:false"><!DOCTYPE html> <html lang="en"> <head> <title>Simple Calculator</title> </head> <body> <input type="number"> <p>How It Works:</p> </pre> <ul> <li>The user enters numbers in two input fields.</li> <li>When the “Add” button is clicked, JavaScript calculates the sum and displays it.</li> </ul> <h2> Key Concepts in JavaScript </h2> <p><strong>Variables:</strong><br> Variables store data that can be used later.</p> <p><strong>Why Use Variables?</strong></p> <p>Variables help you:</p> <ul> <li>Store Information: Keep data in memory for later use.</li> <li>Reuse Values: Avoid rewriting the same value multiple times.</li> <li>Make Code Dynamic: Change variable values to alter program behavior. </li> </ul> <pre class="brush:php;toolbar:false">let name = "John"; // Storing the value "John" in a variable called name console.log(name); // Outputs: John </pre> <p><strong>Functions:</strong><br> In JavaScript, functions are reusable blocks of code designed to <br> perform a specific task. They allow you to write a piece of logic <br> once and use it multiple times, making your code more efficient and <br> organized.<br> </p> <pre class="brush:php;toolbar:false">function greet(name) { return "Hello, " + name; } console.log(greet("Alice")); // Output: Hello, Alice console.log(greet("Bob")); // Output: Hello, Bob </pre> <p>*<em>Events: *</em><br> Events in JavaScript are actions or occurrences that happen in the browser, often triggered by the user (e.g., clicking a button, typing in an input field, or resizing the window). JavaScript can “l(fā)isten” for these events and perform specific actions in response. This is a key concept for creating interactive and dynamic web pages.<br> </p> <pre class="brush:php;toolbar:false"><!DOCTYPE html> <html lang="en"> <head> <title>JavaScript Example</title> </head> <body> <h1> <p>Explanation:</p> </pre> <ul> <li>The getElementById("heading") selects the 'h1' element.</li> <li>.innerText = "Hello, JavaScript!"; changes its text.</li> </ul> <p>Button Click Example<br> You can make a button do something when clicked.<br> </p> <pre class="brush:php;toolbar:false"><!DOCTYPE html> <html lang="en"> <head> <title>Click Example</title> </head> <body> <button> <p>What Happens:</p> </pre> <ul> <li>The button listens for a “click.”</li> <li> When clicked, JavaScript updates the <p> tag with a message.</p> </li> </ul> <p>Simple Calculator<br> Let’s create a calculator for adding two numbers.<br> </p> <pre class="brush:php;toolbar:false"><!DOCTYPE html> <html lang="en"> <head> <title>Simple Calculator</title> </head> <body> <input type="number"> <p>How It Works:</p> <ul> <li>The user enters numbers in two input fields.</li> <li>When the “Add” button is clicked, JavaScript calculates the sum and displays it.</li> </ul> <h2> Key Concepts in JavaScript </h2> <p><strong>Variables:</strong><br> Variables store data that can be used later.</p> <p><strong>Why Use Variables?</strong></p> <p>Variables help you:</p> <ul> <li>Store Information: Keep data in memory for later use.</li> <li>Reuse Values: Avoid rewriting the same value multiple times.</li> <li>Make Code Dynamic: Change variable values to alter program behavior. </li> </ul> <pre class="brush:php;toolbar:false">let name = "John"; // Storing the value "John" in a variable called name console.log(name); // Outputs: John </pre> <p><strong>Loops:</strong><br> In JavaScript, loops are used to repeat a block of code multiple times. They are helpful when you want to perform an action or series of actions several times, such as iterating over items in an array or performing a task until a condition is met.</p> <p>There are several types of loops in JavaScript, each useful for different situations. Let’s go over the most common ones</p> <ul> <li>for Loop:</li> </ul> <p>The for loop is the most basic loop. It repeats a block of code for a specified number of times.<br> </p> <pre class="brush:php;toolbar:false">function greet(name) { return "Hello, " + name; } console.log(greet("Alice")); // Output: Hello, Alice console.log(greet("Bob")); // Output: Hello, Bob </pre> <ul> <li>while Loop:</li> </ul> <p>The while loop runs as long as a specified condition is true. It checks the condition before each iteration.<br> </p> <pre class="brush:php;toolbar:false"><button> <p><strong>Conditions:</strong><br> In JavaScript, conditions are used to perform different actions <br> based on whether a specified condition evaluates to true or false. <br> This helps control the flow of your program, allowing it to make <br> decisions.</p> <p>Why Use Conditions?</p> <ul> <li>Decision Making: Execute code based on specific situations.</li> <li>Dynamic Behavior: React to user input or external data.</li> <li>Error Handling: Handle unexpected cases gracefully. </li> </ul> <pre class="brush:php;toolbar:false">let age = 20; if (age >= 18) { console.log("You are an adult."); } else { console.log("You are not an adult."); } </pre> <ul> <li>do...while Loop:</li> </ul> <p>The do...while loop is similar to the while loop, but it guarantees that the code will run at least once, even if the condition is false initially. It checks the condition after each iteration.<br> </p> <pre class="brush:php;toolbar:false">// Print numbers 1 to 5 for (let i = 1; i <= 5; i++) { console.log(i); } // Output: 1, 2, 3, 4, 5 </pre> <ul> <li>for...in Loop:</li> </ul> <p>The for...in loop is used to iterate over the properties of an object (keys).<br> </p> <pre class="brush:php;toolbar:false">// Print numbers 1 to 5 using a while loop let i = 1; while (i <= 5) { console.log(i); i++; // Don't forget to increment i! } // Output: 1, 2, 3, 4, 5 </pre> <ul> <li>for...of Loop:</li> </ul> <p>The for...of loop is used to iterate over the values in an iterable object (like an array, string, or other iterable objects).<br> </p> <pre class="brush:php;toolbar:false">// Print numbers 1 to 5 using do...while loop let i = 1; do { console.log(i); i++; } while (i <= 5); // Output: 1, 2, 3, 4, 5 </pre> <h2> Where JavaScript is Used </h2> <ol> <li>Frontend Development: JavaScript frameworks like React, Angular, and Vue.js are used to build interactive websites.</li> <li>Backend Development: Node.js allows JavaScript to run on servers, powering backend logic.</li> <li>APIs: JavaScript fetches data from remote servers.</li> </ol> <h2> Why Learn JavaScript? </h2> <ul> <li>Widely Used: Almost every website uses JavaScript.</li> <li>Career Opportunities: Essential for web developers.</li> <li>Easy to Start: You only need a browser to write and test JavaScript.</li> </ul> <h2> Conclusion </h2> <p>JavaScript is a beginner-friendly yet powerful programming language. <br> By practicing simple examples and understanding key concepts, you <br> can unlock the ability to create interactive and engaging web <br> applications!</p> <p>The above is the detailed content of JavaScript and Its Core Concepts: A Beginner's Guide to Web Development. 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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/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/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/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 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/1796831296.html" title="Leveraging Array.prototype Methods for Data Manipulation 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/001/253/068/175174058098308.jpg?x-oss-process=image/resize,m_fill,h_207,w_330" alt="Leveraging Array.prototype Methods for Data Manipulation in JavaScript" /> </a> <a href="http://ipnx.cn/faq/1796831296.html" title="Leveraging Array.prototype Methods for Data Manipulation in JavaScript" class="phphistorical_Version2_mids_title">Leveraging Array.prototype Methods for Data Manipulation in JavaScript</a> <span id="wjcelcm34c" class="Articlelist_txts_time">Jul 06, 2025 am 02:36 AM</span> <p class="Articlelist_txts_p">JavaScript array built-in methods such as .map(), .filter() and .reduce() can simplify data processing; 1) .map() is used to convert elements one to one to generate new arrays; 2) .filter() is used to filter elements by condition; 3) .reduce() is used to aggregate data as a single value; misuse should be avoided when used, resulting in side effects or performance problems.</p> </div> <div id="wjcelcm34c" class="phphistorical_Version2_mids"> <a href="http://ipnx.cn/faq/1796832563.html" title="JS roundup: a deep dive into the JavaScript event loop" 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/001/431/639/175191266081499.jpg?x-oss-process=image/resize,m_fill,h_207,w_330" alt="JS roundup: a deep dive into the JavaScript event loop" /> </a> <a href="http://ipnx.cn/faq/1796832563.html" title="JS roundup: a deep dive into the JavaScript event loop" class="phphistorical_Version2_mids_title">JS roundup: a deep dive into the JavaScript event loop</a> <span id="wjcelcm34c" class="Articlelist_txts_time">Jul 08, 2025 am 02:24 AM</span> <p class="Articlelist_txts_p">JavaScript's event loop manages asynchronous operations by coordinating call stacks, WebAPIs, and task queues. 1. The call stack executes synchronous code, and when encountering asynchronous tasks, it is handed over to WebAPI for processing; 2. After the WebAPI completes the task in the background, it puts the callback into the corresponding queue (macro task or micro task); 3. The event loop checks whether the call stack is empty. If it is empty, the callback is taken out from the queue and pushed into the call stack for execution; 4. Micro tasks (such as Promise.then) take precedence over macro tasks (such as setTimeout); 5. Understanding the event loop helps to avoid blocking the main thread and optimize the code execution order.</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'); var curProtocol = window.location.protocol.split(':')[0]; if (curProtocol === 'https') { bp.src = 'https://zz.bdstatic.com/linksubmit/push.js'; } else { bp.src = 'http://push.zhanzhang.baidu.com/push.js'; } var s = document.getElementsByTagName("script")[0]; s.parentNode.insertBefore(bp, s); })(); </script> </body><div id="b3db5" class="pl_css_ganrao" style="display: none;"><i id="b3db5"></i><th id="b3db5"><form id="b3db5"><optgroup id="b3db5"><strong id="b3db5"></strong></optgroup></form></th><i id="b3db5"></i><sup id="b3db5"><center id="b3db5"></center></sup><th id="b3db5"><nobr id="b3db5"><dfn id="b3db5"></dfn></nobr></th><sub id="b3db5"><big id="b3db5"></big></sub><tt id="b3db5"></tt><em id="b3db5"><dfn id="b3db5"><strong id="b3db5"></strong></dfn></em><nobr id="b3db5"></nobr><form id="b3db5"></form><rt id="b3db5"><acronym id="b3db5"></acronym></rt><style id="b3db5"><table id="b3db5"></table></style><object id="b3db5"><p id="b3db5"><fieldset id="b3db5"><ol id="b3db5"></ol></fieldset></p></object><i id="b3db5"></i><strike id="b3db5"><th id="b3db5"><strike id="b3db5"></strike></th></strike><meter id="b3db5"></meter><wbr id="b3db5"></wbr><kbd id="b3db5"></kbd><ruby id="b3db5"></ruby><center id="b3db5"><progress id="b3db5"><thead id="b3db5"><strong id="b3db5"></strong></thead></progress></center><em id="b3db5"></em><u id="b3db5"></u><blockquote id="b3db5"><samp id="b3db5"><ins id="b3db5"><output id="b3db5"></output></ins></samp></blockquote><form id="b3db5"></form><font id="b3db5"><em id="b3db5"><del id="b3db5"></del></em></font><div id="b3db5"></div><listing id="b3db5"><optgroup id="b3db5"><nav id="b3db5"><style id="b3db5"></style></nav></optgroup></listing><output id="b3db5"><ruby id="b3db5"><b id="b3db5"><ins id="b3db5"></ins></b></ruby></output><samp id="b3db5"><delect id="b3db5"><ins id="b3db5"><div id="b3db5"></div></ins></delect></samp><form id="b3db5"><label id="b3db5"></label></form><thead id="b3db5"></thead><pre id="b3db5"></pre><tbody id="b3db5"><listing id="b3db5"><var id="b3db5"><menu id="b3db5"></menu></var></listing></tbody><noframes id="b3db5"></noframes><listing id="b3db5"><tr id="b3db5"><em id="b3db5"><span id="b3db5"></span></em></tr></listing><b id="b3db5"><table id="b3db5"><legend id="b3db5"><td id="b3db5"></td></legend></table></b><object id="b3db5"><dfn id="b3db5"><li id="b3db5"></li></dfn></object><rp id="b3db5"><track id="b3db5"><th id="b3db5"></th></track></rp><meter id="b3db5"></meter><optgroup id="b3db5"></optgroup><tbody id="b3db5"><small id="b3db5"><abbr id="b3db5"><form id="b3db5"></form></abbr></small></tbody><dd id="b3db5"><div id="b3db5"></div></dd><nav id="b3db5"><th id="b3db5"><b id="b3db5"></b></th></nav><tbody id="b3db5"><dfn id="b3db5"><table id="b3db5"><optgroup id="b3db5"></optgroup></table></dfn></tbody><cite id="b3db5"></cite><p id="b3db5"></p><dfn id="b3db5"></dfn><kbd id="b3db5"></kbd><pre id="b3db5"><center id="b3db5"><big id="b3db5"></big></center></pre><strong id="b3db5"></strong></div> </html>