javascript nextSibling属性「建议收藏」对于nextSibling属性，在W3school中的定义为：nextSibling属性返回指定节点之后紧跟的节点，在相同的树层级中。注意所返回的节点必须是与上一个节点是同级关系，且彼此之间不能有空格，否则将会返回：undefinedTitl</p>
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<div class="entry-content text-indent">
<p>大家好，又见面了，我是你们的朋友全栈君。<svg xmlns="http://www.w3.org/2000/svg" style="display: none;"> <path stroke-linecap="round" d="M5,0 0,2.5 5,5z" id="raphael-marker-block" style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0);"></path> </svg> </p>
<p>对于nextSibling属性，在W3school中的定义为： </p>
<pre class="prettyprint"><code class=" hljs ">nextSibling 属性返回指定节点之后紧跟的节点，在相同的树层级中。</code></pre>
<h3 id="注意所返回的节点必须是与上一个节点是同级关系且彼此之间不能有空格否则将会返回undefined">注意所返回的节点必须是与上一个节点是同级关系，且彼此之间不能有空格，否则将会返回：undefined</h3>
<pre class="prettyprint"><code class=" hljs xml"><span class="hljs-doctype"><!DOCTYPE html></span>
<span class="hljs-tag"><<span class="hljs-title">html</span> <span class="hljs-attribute">lang</span>=<span class="hljs-value">"en"</span>></span>
<span class="hljs-tag"><<span class="hljs-title">head</span>></span>
<span class="hljs-tag"><<span class="hljs-title">meta</span> <span class="hljs-attribute">charset</span>=<span class="hljs-value">"UTF-8"</span>></span>
<span class="hljs-tag"><<span class="hljs-title">title</span>></span>Title<span class="hljs-tag"></<span class="hljs-title">title</span>></span>
<span class="hljs-tag"><<span class="hljs-title">link</span> <span class="hljs-attribute">rel</span>=<span class="hljs-value">"stylesheet"</span> <span class="hljs-attribute">href</span>=<span class="hljs-value">"css/style.css"</span> <span class="hljs-attribute">media</span>=<span class="hljs-value">"screen"</span>></span>
<span class="hljs-tag"></<span class="hljs-title">head</span>></span>
<span class="hljs-tag"><<span class="hljs-title">body</span>></span>
<span class="hljs-comment"><!-- <p id="p">this is a test project!</p> <p id="p2">this is a test project2.</p>--></span>
<span class="hljs-tag"><<span class="hljs-title">ul</span>></span>
<span class="hljs-tag"><<span class="hljs-title">li</span> <span class="hljs-attribute">id</span>=<span class="hljs-value">"a"</span>></span>hello<span class="hljs-tag"></<span class="hljs-title">li</span>></span>
<span class="hljs-tag"><<span class="hljs-title">li</span> <span class="hljs-attribute">id</span>=<span class="hljs-value">"b"</span>></span>world<span class="hljs-tag"></<span class="hljs-title">li</span>></span>
<span class="hljs-tag"></<span class="hljs-title">ul</span>></span>
<span class="hljs-tag"><<span class="hljs-title">script</span> <span class="hljs-attribute">type</span>=<span class="hljs-value">"text/javascript"</span> <span class="hljs-attribute">src</span>=<span class="hljs-value">"scripts/test.js"</span>></span><span class="javascript"></span><span class="hljs-tag"></<span class="hljs-title">script</span>></span>
<span class="hljs-tag"></<span class="hljs-title">body</span>></span>
<span class="hljs-tag"></<span class="hljs-title">html</span>></span>
test.js
window.onload=function(){
/* var a=document.getElementById("p");
a.style.color="black";*/
var a=document.getElementById("a").nextSibling.id;
alert(a);
}</code></pre>
<p>返回结果如下图：</p>
<p><noscript><img decoding="async" src="http://qn.javajgs.com/20220713/99934025-023a-4acd-8734-e867a2075e3b20220713a6a8bd54-3e74-4ea3-9b69-07f08f321f351.jpg" title="" alt="这里写图片描述"></noscript><img decoding="async" class="j-lazy" src="https://javaforall.net/wp-content/uploads/2020/11/2020110817443450.jpg" data-original="http://qn.javajgs.com/20220713/99934025-023a-4acd-8734-e867a2075e3b20220713a6a8bd54-3e74-4ea3-9b69-07f08f321f351.jpg" title="" alt="这里写图片描述"></p>
<p>在此我把它改动一下：</p>
<pre class="prettyprint"><code class=" hljs xml"><span class="hljs-doctype"><!DOCTYPE html></span>
<span class="hljs-tag"><<span class="hljs-title">html</span> <span class="hljs-attribute">lang</span>=<span class="hljs-value">"en"</span>></span>
<span class="hljs-tag"><<span class="hljs-title">head</span>></span>
<span class="hljs-tag"><<span class="hljs-title">meta</span> <span class="hljs-attribute">charset</span>=<span class="hljs-value">"UTF-8"</span>></span>
<span class="hljs-tag"><<span class="hljs-title">title</span>></span>Title<span class="hljs-tag"></<span class="hljs-title">title</span>></span>
<span class="hljs-tag"><<span class="hljs-title">link</span> <span class="hljs-attribute">rel</span>=<span class="hljs-value">"stylesheet"</span> <span class="hljs-attribute">href</span>=<span class="hljs-value">"css/style.css"</span> <span class="hljs-attribute">media</span>=<span class="hljs-value">"screen"</span>></span>
<span class="hljs-tag"></<span class="hljs-title">head</span>></span>
<span class="hljs-tag"><<span class="hljs-title">body</span>></span>
<span class="hljs-comment"><!-- <p id="p">this is a test project!</p> <p id="p2">this is a test project2.</p>--></span>
<span class="hljs-tag"><<span class="hljs-title">ul</span>></span>
<span class="hljs-tag"><<span class="hljs-title">li</span> <span class="hljs-attribute">id</span>=<span class="hljs-value">"a"</span>></span>hello<span class="hljs-tag"></<span class="hljs-title">li</span>></span><span class="hljs-tag"><<span class="hljs-title">li</span> <span class="hljs-attribute">id</span>=<span class="hljs-value">"b"</span>></span>world<span class="hljs-tag"></<span class="hljs-title">li</span>></span>
<span class="hljs-tag"></<span class="hljs-title">ul</span>></span>
<span class="hljs-tag"><<span class="hljs-title">script</span> <span class="hljs-attribute">type</span>=<span class="hljs-value">"text/javascript"</span> <span class="hljs-attribute">src</span>=<span class="hljs-value">"scripts/test.js"</span>></span><span class="javascript"></span><span class="hljs-tag"></<span class="hljs-title">script</span>></span>
<span class="hljs-tag"></<span class="hljs-title">body</span>></span>
<span class="hljs-tag"></<span class="hljs-title">html</span>></span>
test.js
window.onload=function(){
/* var a=document.getElementById("p");
a.style.color="black";*/
var a=document.getElementById("a").nextSibling.id;
alert(a);
}
</code></pre>
<p>返回结果如下：</p>
<p><noscript><img decoding="async" src="http://qn.javajgs.com/20220713/eeeac340-77bc-48c8-8ce9-982abdb54da220220713e8b91106-314e-4f0d-9025-1c5f972e9e361.jpg" title="" alt="这里写图片描述"></noscript><img decoding="async" class="j-lazy" src="https://javaforall.net/wp-content/uploads/2020/11/2020110817443450.jpg" data-original="http://qn.javajgs.com/20220713/eeeac340-77bc-48c8-8ce9-982abdb54da220220713e8b91106-314e-4f0d-9025-1c5f972e9e361.jpg" title="" alt="这里写图片描述"></p>
<p>在此我得再提一次，我只是做了一次小小的改动，如下图将无序列表中的</p>
<ul>
<li></li>
<li>元素之间的距离改了一下，将红色的部分缩进了一下。而返回的结果完全不同。
</p>
<p><noscript><img decoding="async" src="http://qn.javajgs.com/20220713/4b9363c3-11eb-4583-a776-a5de76709f7f202207131d71dad3-0e3c-455c-84d8-8b99665e3ec31.jpg" title="" alt="这里写图片描述"></noscript><img decoding="async" class="j-lazy" src="https://javaforall.net/wp-content/uploads/2020/11/2020110817443450.jpg" data-original="http://qn.javajgs.com/20220713/4b9363c3-11eb-4583-a776-a5de76709f7f202207131d71dad3-0e3c-455c-84d8-8b99665e3ec31.jpg" title="" alt="这里写图片描述"></p>
</li>
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<p>指示函数和sign函数（符号函数）1 指示函数 1A x 1 x nbsp nbsp A0 x nbsp nbsp A1 A x begin cases 1 amp text x in A 0 amp text x notin A end cases 1A x 1 0 x nbsp nbsp Ax nbsp nbsp A 1A X 0 1 1 A X rightarrow 0 1 1A X 0 1 2 Sigmoid 函数 y 11 e x</p>
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<span class="item-meta-li date">2026年3月17日</span>
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