\n
\n\n\n\n

The DOM for this document might look like this:
\n<\/p>\n\n

Document\n ├── html\n     ├── head\n     │    └── title\n     └── body\n          └── div#content\n               ├── h1\n               └── p\n<\/pre>\n\n\n\n

\n \n \n JavaScript 如何使用 DOM:\n<\/h3>\n\n
    \n
  1. \n訪問(wèn)元素<\/strong>:JavaScript 可以使用 document.getElementById() 或 document.querySelector() 等方法從 DOM 中選擇和訪問(wèn)元素。\n<\/li>\n<\/ol>\n\n
       let heading = document.getElementById(\"content\");\n<\/pre>\n\n\n\n
      \n
    1. \n操作元素<\/strong>:JavaScript 可以修改元素的內(nèi)容、屬性或樣式。\n<\/li>\n<\/ol>\n\n
         heading.innerHTML = \"New Content\";\n   heading.style.color = \"red\";\n<\/pre>\n\n\n\n
        \n
      1. \n事件處理<\/strong>:JavaScript 可以將事件偵聽(tīng)器附加到 DOM 元素,以響應(yīng)用戶操作,例如單擊、按鍵等。\n<\/li>\n<\/ol>\n\n
           document.getElementById(\"myButton\").addEventListener(\"click\", function() {\n     alert(\"Button clicked!\");\n   });\n<\/pre>\n\n\n\n
          \n
        1. \n創(chuàng)建和刪除元素<\/strong>:JavaScript 可以動(dòng)態(tài)創(chuàng)建新元素或刪除現(xiàn)有元素。\n<\/li>\n<\/ol>\n\n
             const newElement = document.createElement(\"div\");\n   document.body.appendChild(newElement);\n<\/pre>\n\n\n\n

          \n \n \n 為什么 DOM 很重要:\n<\/h3>\n\n<\/pre>\n
            \n
          • 它為 JavaScript 提供了一種與網(wǎng)頁(yè)的結(jié)構(gòu)和內(nèi)容交互并操作網(wǎng)頁(yè)的結(jié)構(gòu)和內(nèi)容的方法。<\/li>\n
          • 它允許動(dòng)態(tài)、交互式網(wǎng)頁(yè),無(wú)需重新加載頁(yè)面(例如,更新 UI 或處理用戶輸入)。<\/li>\n<\/ul>\n\n

            \n \n \n DOM 方法:\n<\/h3>\n\n

            以下是 JavaScript 中一些常用的 DOM 方法:<\/p>\n

              \n
            • \ngetElementById():通過(guò) ID 選擇元素。<\/li>\n
            • \nquerySelector():使用 CSS 選擇器選擇第一個(gè)匹配元素。<\/li>\n
            • \ncreateElement():創(chuàng)建一個(gè)新的 HTML 元素。<\/li>\n
            • \nappendChild():向元素添加新的子節(jié)點(diǎn)。<\/li>\n
            • \nremoveChild():從元素中刪除子節(jié)點(diǎn)。<\/li>\n
            • \nsetAttribute():設(shè)置元素的屬性。<\/li>\n
            • \naddEventListener():將事件處理程序附加到元素。<\/li>\n<\/ul>\n\n

              \n \n \n 實(shí)際應(yīng)用示例:\n<\/h3>\n\n\n\n
              \n\n  \n    My Page<\/title>\n  <\/head>\n  <body>
              <h1><a href="http://m.miracleart.cn/">国产av日韩一区二区三区精品,成人性爱视频在线观看,国产,欧美,日韩,一区,www.成色av久久成人,2222eeee成人天堂</a></h1>\n    <div>\n\n\n\n<p>The DOM for this document might look like this:<br>\n<\/p>\n\n<pre>Document\n ├── html\n     ├── head\n     │    └── title\n     └── body\n          └── div#content\n               ├── h1\n               └── p\n<\/pre>\n\n\n\n<p>在此示例中,選擇了 h1 元素,更新了其內(nèi)容,并附加了一個(gè)單擊事件偵聽(tīng)器。單擊標(biāo)題時(shí),會(huì)顯示一條警報(bào)。<\/p>\n\n<p>DOM 是使用 JavaScript 動(dòng)態(tài)操作網(wǎng)頁(yè)結(jié)構(gòu)的基本概念,也是創(chuàng)建交互式 Web 應(yīng)用程序的基礎(chǔ)。<\/p>\n\n\n          <\/pre><\/a><\/p>\n<\/div>\n\n            \n        <\/li>\n<\/ol>"}	</script>
              	
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              						<span>JavaScript 中的 DOM(文檔對(duì)象模型)是什么</span>
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              							<h1 class="Articlelist_txts_title">JavaScript 中的 DOM(文檔對(duì)象模型)是什么</h1>
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              									<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">
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              																			<a href="http://m.miracleart.cn/zh/member/1468492.html" class="author_name">Mary-Kate Olsen</a>
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              							<span id="377j5v51b"    class="Articlelist_txts_time">Nov 27, 2024 pm	 06:30 PM</span>
              														
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              					<p><img src="/static/imghw/default1.png" data-src="https://img.php.cn/upload/article/000/000/000/173270341541063.jpg" class="lazy" alt="What is DOM (Document Object Modle) in JavaScript"></p>
              <p><strong>DOM</strong>(文檔對(duì)象模型)是 Web 文檔的編程接口。它將網(wǎng)頁(yè)的結(jié)構(gòu)表示為對(duì)象樹(shù),其中每個(gè)對(duì)象對(duì)應(yīng)于頁(yè)面的一部分,例如元素、屬性和文本內(nèi)容。</p>
              
              <p>在 JavaScript 中,DOM 允許您以編程方式與 HTML 或 XML 文檔進(jìn)行交互。它使您能夠動(dòng)態(tài)修改網(wǎng)頁(yè)的內(nèi)容、結(jié)構(gòu)和樣式。</p>
              
              <h3>
                
                
                DOM 的關(guān)鍵概念:
              </h3>
              
              <ol>
              <li>
              <strong>文檔</strong>:指整個(gè)網(wǎng)頁(yè)。</li>
              <li>
              <strong>元素</strong>:表示<div>、<p>、<a>等HTML標(biāo)簽
              <li>
              <strong>節(jié)點(diǎn)</strong>:DOM樹(shù)中的基本單元,可以是元素、文本或?qū)傩浴?/li>
              <li>
              <strong>DOM 樹(shù)</strong>:將網(wǎng)頁(yè)表示為節(jié)點(diǎn)樹(shù)的分層結(jié)構(gòu)。根節(jié)點(diǎn)是文檔,每個(gè) HTML 元素都是從它分支的節(jié)點(diǎn)。</li>
              
              
              <h3>
                
                
                DOM 表示示例:
              </h3>
              
              <p>對(duì)于 HTML 文檔,例如:<br>
              </p>
              
              <pre class="brush:php;toolbar:false"><!DOCTYPE html>
              <html>
                <head>
                  <title>My Page</title>
                </head>
                <body>
                  <div>
              
              
              
              <p>The DOM for this document might look like this:<br>
              </p>
              
              <pre class="brush:php;toolbar:false">Document
               ├── html
                   ├── head
                   │    └── title
                   └── body
                        └── div#content
                             ├── h1
                             └── p
              </pre>
              
              
              
              <h3>
                
                
                JavaScript 如何使用 DOM:
              </h3>
              
              <ol>
              <li>
              <strong>訪問(wèn)元素</strong>:JavaScript 可以使用 document.getElementById() 或 document.querySelector() 等方法從 DOM 中選擇和訪問(wèn)元素。
              </li>
              </ol>
              
              <pre class="brush:php;toolbar:false">   let heading = document.getElementById("content");
              </pre>
              
              
              
              <ol>
              <li>
              <strong>操作元素</strong>:JavaScript 可以修改元素的內(nèi)容、屬性或樣式。
              </li>
              </ol>
              
              <pre class="brush:php;toolbar:false">   heading.innerHTML = "New Content";
                 heading.style.color = "red";
              </pre>
              
              
              
              <ol>
              <li>
              <strong>事件處理</strong>:JavaScript 可以將事件偵聽(tīng)器附加到 DOM 元素,以響應(yīng)用戶操作,例如單擊、按鍵等。
              </li>
              </ol>
              
              <pre class="brush:php;toolbar:false">   document.getElementById("myButton").addEventListener("click", function() {
                   alert("Button clicked!");
                 });
              </pre>
              
              
              
              <ol>
              <li>
              <strong>創(chuàng)建和刪除元素</strong>:JavaScript 可以動(dòng)態(tài)創(chuàng)建新元素或刪除現(xiàn)有元素。
              </li>
              </ol>
              
              <pre class="brush:php;toolbar:false">   const newElement = document.createElement("div");
                 document.body.appendChild(newElement);
              </pre>
              
              
              
              <h3>
                
                
                為什么 DOM 很重要:
              </h3>
              
              </pre>
              <ul>
              <li>它為 JavaScript 提供了一種與網(wǎng)頁(yè)的結(jié)構(gòu)和內(nèi)容交互并操作網(wǎng)頁(yè)的結(jié)構(gòu)和內(nèi)容的方法。</li>
              <li>它允許動(dòng)態(tài)、交互式網(wǎng)頁(yè),無(wú)需重新加載頁(yè)面(例如,更新 UI 或處理用戶輸入)。</li>
              </ul>
              
              <h3>
                
                
                DOM 方法:
              </h3>
              
              <p>以下是 JavaScript 中一些常用的 DOM 方法:</p>
              <ul>
              <li>
              getElementById():通過(guò) ID 選擇元素。</li>
              <li>
              querySelector():使用 CSS 選擇器選擇第一個(gè)匹配元素。</li>
              <li>
              createElement():創(chuàng)建一個(gè)新的 HTML 元素。</li>
              <li>
              appendChild():向元素添加新的子節(jié)點(diǎn)。</li>
              <li>
              removeChild():從元素中刪除子節(jié)點(diǎn)。</li>
              <li>
              setAttribute():設(shè)置元素的屬性。</li>
              <li>
              addEventListener():將事件處理程序附加到元素。</li>
              </ul>
              
              <h3>
                
                
                實(shí)際應(yīng)用示例:
              </h3>
              
              
              
              <pre class="brush:php;toolbar:false"><!DOCTYPE html>
              <html>
                <head>
                  <title>My Page</title>
                </head>
                <body>
                  <div>
              
              
              
              <p>The DOM for this document might look like this:<br>
              </p>
              
              <pre class="brush:php;toolbar:false">Document
               ├── html
                   ├── head
                   │    └── title
                   └── body
                        └── div#content
                             ├── h1
                             └── p
              </pre>
              
              
              
              <p>在此示例中,選擇了 h1 元素,更新了其內(nèi)容,并附加了一個(gè)單擊事件偵聽(tīng)器。單擊標(biāo)題時(shí),會(huì)顯示一條警報(bào)。</p>
              
              <p>DOM 是使用 JavaScript 動(dòng)態(tài)操作網(wǎng)頁(yè)結(jié)構(gòu)的基本概念,也是創(chuàng)建交互式 Web 應(yīng)用程序的基礎(chǔ)。</p>
              
              
                        </pre></a></p>
              </div>
              
                          
                      </li>
              </ol><p>以上是JavaScript 中的 DOM(文檔對(duì)象模型)是什么的詳細(xì)內(nèi)容。更多信息請(qǐng)關(guān)注PHP中文網(wǎng)其他相關(guān)文章!</p>
              
              
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