<style id="1g0qa"></style>
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>??:<\/strong><br>\n JavaScript?? ??? <br> ???? ??? ??? ??? ?? ?????.\n ?? ??? ?????. ?? ?? ??? ??? ? ???? <br>\n ? ? ???? ?? ? ???? ??? ? ????? <br>\n ??????.<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>???: *<\/em><br>\n JavaScript? ???? ?????? ???? ?? ?? ????, ?? ???? ?? ??????(?: ?? ??, ?? ??? ?? ?? ? ?? ??). JavaScript? ??? ???? \"??\"?? ?? ?? ???? ?? ??? ??? ? ????. ?? ???? ?? ????? ??? ?? ?? ?????.<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>??:<\/strong><br>\n JavaScript?? ??? ?? ??? ?? ? ???? ? ?????. ??? ??? ????? ??? ??? ??? ??? ???? ? ?? ?? ??? ??? ?? ? ????? ??? ?????.<\/p>\n\n<p>JavaScript?? ??? ??? ??? ?? ??? ??? ????. ?? ???? ?? ???????<\/p>\n\n<ul>\n<li>for ??:<\/li>\n<\/ul>\n\n<p>for ??? ?? ???? ?????. ??? ???? ?? ??? ?????.<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 ??:<\/li>\n<\/ul>\n\n<p>??? ??? true? ?? while ??? ?????. ? ?? ?? ??? ?????.<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 ??:<\/li>\n<\/ul>\n\n<p>do...while ??? while ??? ????? ??? ??? false? ???? ??? ??? ? ? ????? ?? ?????. ? ?? ?? ??? ?????.<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 ??:<\/li>\n<\/ul>\n\n<p>for...in ??? ??(?)? ??? ???? ? ?????.<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 ??:<\/li>\n<\/ul>\n\n<p>for...of ??? ?? ??? ??(?: ??, ??? ?? ?? ?? ??? ??)? ?? ???? ? ?????.<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 JavaScript? ???? ?\n<\/h2>\n\n<ol>\n<li>????? ??:\nReact, Angular ? Vue.js? ?? JavaScript ?????? ??? ?? ? ?????. \n??? ????? ?????.<\/li>\n<li>??? ??:\nNode.js? ???? JavaScript? ???? ???? ??? ??? ??? ? ????.<\/li>\n<li>API:\nJavaScript? ?? ???? ???? ?????.<\/li>\n<\/ol>\n\n<h2>\n \n \n ? ??????? ??? ????\n<\/h2>\n\n<ul>\n<li>?? ???: ?? ?? ?????? 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?????</a> <img src="/static/imghw/top_right.png" alt="" /> <a href="http://ipnx.cn/ko/js-tutorial.html" class="phpgenera_Details_mainL1a">JS ????</a> <img src="/static/imghw/top_right.png" alt="" /> <span>JavaScript? ?? ??: ? ?? ???? ?? ???</span> </div> <div id="wjcelcm34c" class="Articlelist_txts"> <div id="wjcelcm34c" class="Articlelist_txts_info"> <h1 class="Articlelist_txts_title">JavaScript? ?? ??: ? ?? ???? ?? ???</h1> <div id="wjcelcm34c" class="Articlelist_txts_info_head"> <div id="wjcelcm34c" class="author_info"> <a href="http://ipnx.cn/ko/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/ko/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> ??????? ?????? </h2> <p>JavaScript? ????? ????? ???? ??? ? ??? ?? ????? ?????. HTML? ???? ???? ???? ? ???? CSS? ???? ???? ? ???? ??, JavaScript? ??? ???? ????? ??? ??? ??? ? ??? ????.</p> <p>?:<br> ? ??? ???? ?? ?? ?????(?: ?? ??).<br> ? ????? ???? ???? ?????.<br> ? ??? ?? ?? ?? ??(??? ?? ?)? ?????.</p> <p><strong>JavaScript? ?? ??(??)</strong></p> <ol> <li>?????? ??: JavaScript? Chrome, Firefox, Safari? ?? ?????? ?? ????? ?? ?? ?? ?????.</li> <li>??: ????? ?? ???? ??? ????(??? ?? ??)? ??? ? ????.</li> <li>???: ??, ??? ???, ? ???? ?? ???? ?????.</li> <li>??: ?????? ?? ???? ??? ??? ?????.</li> <li>???? ??: JavaScript? ????(?????)? ??(???, Node.js ??) ???? ?????.</li> </ol> <p><strong>JavaScript ?? ??(???)</strong></p> <p>????? ??? ?:</p> <ol> <li>JavaScript ??: ????? HTML ? CSS? ?? JavaScript ??? ?????.</li> <li>?? ??: ????? JavaScript ??(?: Chrome? V8)? JavaScript? ? ?? ?????.</li> <li>???? ????: JavaScript? ??? ?? ???? ??? ????? ??? ? ????.</li> </ol> <ul> <li>?? ?? ?? ??.</li> <li>???? ?? ???? ???? ?????.</li> <li>??? ??? ?? ???? ????? ????.</li> </ul> <p><strong>??? ??? ?? ??</strong></p> <p>???? ??? ??<br> ??? ?? JavaScript? ??? ???? ???? ???? ??? ?????.<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>??:</strong><br> JavaScript?? ??? <br> ???? ??? ??? ??? ?? ?????. ?? ??? ?????. ?? ?? ??? ??? ? ???? <br> ? ? ???? ?? ? ???? ??? ? ????? <br> ??????.<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>???: *</em><br> JavaScript? ???? ?????? ???? ?? ?? ????, ?? ???? ?? ??????(?: ?? ??, ?? ??? ?? ?? ? ?? ??). JavaScript? ??? ???? "??"?? ?? ?? ???? ?? ??? ??? ? ????. ?? ???? ?? ????? ??? ?? ?? ?????.<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>??:</strong><br> JavaScript?? ??? ?? ??? ?? ? ???? ? ?????. ??? ??? ????? ??? ??? ??? ??? ???? ? ?? ?? ??? ??? ?? ? ????? ??? ?????.</p> <p>JavaScript?? ??? ??? ??? ?? ??? ??? ????. ?? ???? ?? ???????</p> <ul> <li>for ??:</li> </ul> <p>for ??? ?? ???? ?????. ??? ???? ?? ??? ?????.<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 ??:</li> </ul> <p>??? ??? true? ?? while ??? ?????. ? ?? ?? ??? ?????.<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 ??:</li> </ul> <p>do...while ??? while ??? ????? ??? ??? false? ???? ??? ??? ? ? ????? ?? ?????. ? ?? ?? ??? ?????.<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 ??:</li> </ul> <p>for...in ??? ??(?)? ??? ???? ? ?????.<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 ??:</li> </ul> <p>for...of ??? ?? ??? ??(?: ??, ??? ?? ?? ?? ??? ??)? ?? ???? ? ?????.<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> JavaScript? ???? ? </h2> <ol> <li>????? ??: React, Angular ? Vue.js? ?? JavaScript ?????? ??? ?? ? ?????. ??? ????? ?????.</li> <li>??? ??: Node.js? ???? JavaScript? ???? ???? ??? ??? ??? ? ????.</li> <li>API: JavaScript? ?? ???? ???? ?????.</li> </ol> <h2> ? ??????? ??? ???? </h2> <ul> <li>?? ???: ?? ?? ?????? JavaScript? ?????.</li> <li>?? ??: ? ????? ?????.</li> <li>?? ??: JavaScript? ???? ?????? ????? ??? ???.</li> </ul> <h2> ?? </h2> <p>JavaScript? ????? ?????? ??? ????? ?????. <br> ??? ??? ???? ?? ??? ???? <br> ???? ???? ?? ??? ??? ??? ? ???? <br> ?????!</p> <p>? ??? JavaScript? ?? ??: ? ?? ???? ?? ???? ?? ?????. ??? ??? 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