本篇文章给大家带来的内容是关于什么事dom对象？dom对象简介，有一定的参考价值，有需要的朋友可以参考一下，希望对你有所帮助。
一、DOM对象
DOM，全称“Document Object Model（文档对象模型）”，它是由W3C组织定义的一个标准。
在前端开发时，我们往往需要在页面某个地方添加一个元素或者删除元素，这种添加元素、删除元素的操作就是通过DOM来实现的。
说白了，DOM就是一个接口，我们可以通过DOM来操作页面中各种元素，例如添加元素、删除元素、替换元素等。这下大家就懂了吧。记住，DOM就是文档对象模型，文档对象模型就是DOM，很多人在学习DOM的时候看到“文档对象模型”还不知道是什么？
二、DOM结构
DOM采用树形结构作为分层结构，以树节点形式表示页面中各种元素或内容。
举例：
<title>
<body>
<h1>php中文网</h1>
<p>php中文网成立.....</p>
</body>
</html></pre><p>在DOM中，每一个元素看成一个节点，而每一个节点就是一个“对象”。也就是我们在操作元素时，把每一个元素节点看成一个对象，然后使用这个对象的属性和方法进行相关操作。（这句话对理解DOM操作太重要了）。</p>
<p>下面我们介绍几个关于节点的概念。</p><div class="aritcle_card flexRow">
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<p>1、根节点</p>
<p>在HTML文档中，html就是根节点。</p>
<p>2、父节点</p>
<p>一个节点之上的节点就是该节点的父节点，例如h1的父节点就是body，body的父节点就是html。</p>
<p>3、子节点</p>
<p>一个节点之下的节点就是该节点的子节点，例如h1就是body的子节点。</p>
<p>4、兄弟节点</p>
<p>如果多个节点在同一层次，并拥有相同的父节点，那么这几个节点就是兄弟节点。</p>
<p>例如h1和p就是兄弟节点，因为他们拥有相同的父节点body。</p>
<p>以上就是对什么是DOM对象？DOM对象简介的全部介绍，如果您想了解更多有关<a href="http://www.php.cn/course/list/14.html" target="_self">CSS3教程</a>，请关注PHP中文网。</p> </div>
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setCookie('is_article', 1, 1);
</script>
<script>
var is_login = "0";
var show = 0;
var ceng = getCookie('ceng');
//未登录复制显示登录按钮
if(is_login == 0 && false){
$(".code").hover(function(){
$(this).find('.contentsignin').show();
},function(){
$(this).find('.contentsignin').hide();
});
//不给复制
$('.code').bind("cut copy paste",function(e) {
e.preventDefault();
});
$('.code .contentsignin').click(function(){
$(document).trigger("api.loginpopbox");
})
}else{
// 获取所有的 <pre> 元素
var preElements = document.querySelectorAll('pre');
preElements.forEach(function(preElement) {
// 创建复制按钮
var copyButton = document.createElement('button');
copyButton.className = 'copy-button';
copyButton.textContent = '复制';
// 添加点击事件处理程序
copyButton.addEventListener('click', function() {
// 获取当前按钮所属的 <pre> 元素中的文本内容
var textContent = preElement.textContent.trim();
// 创建一个临时 textarea 元素并设置其值为 <pre> 中的文本内容
var tempTextarea = document.createElement('textarea');
tempTextarea.value = textContent;
// 将临时 textarea 添加到文档中
document.body.appendChild(tempTextarea);
// 选中临时 textarea 中的文本内容并执行复制操作
tempTextarea.select();
document.execCommand('copy');
// 移除临时 textarea 元素
document.body.removeChild(tempTextarea);
// 更新按钮文本为 "已复制"
this.textContent = '已复制';
});
// 创建AI写代码按钮
var aiButton = document.createElement('button');
aiButton.className = 'copy-button';
aiButton.textContent = 'AI写代码';
aiButton.style.marginLeft = '5px';
aiButton.style.marginRight = '5px';
// 添加点击事件处理程序
aiButton.addEventListener('click', function() {
// Generate a random number between 0 and 1
var randomChance = Math.random();
// If the random number is less than 0.5, open the first URL, else open the second
if (randomChance < 0.5) {
window.open('https://www.doubao.com/chat/coding?channel=php&source=hw_db_php', '_blank');
} else {
window.open('https://click.aliyun.com/m/1000402709/', '_blank');
}
});
// 将按钮添加到 <pre> 元素前面
preElement.parentNode.insertBefore(copyButton, preElement);
preElement.parentNode.insertBefore(aiButton, preElement);
});
}
</script>