js+css+html制作简易留言板

• 1 案例说明
• 2 编写HTML代码
• 3 编写css代码
• 4 编写JavaScript代码
• 5 全部代码

1 案例说明

利用JavaScript、css以及html制作简易留言板，也可以看作是简易评论区。

要求在页面文本框中输入一些文字之后，点击“发布”按钮，就可以让输入的文字显示在下面，重新输入一些文字，再点击发布，就可以让新发布的内容显示在最上面。点击后面的删除，就可以删除已经发布的文字。

【案例分析】利用节点的创建、添加和删除相关知识完成一个简易的留言板功能。在页面中实现单击“发布”按钮动态创建一个li元素，添加到ul里面。

效果图：

点击发布之后：

再输入一行文字：

点击发布：

点击最下面的那一条删除之后：

2 编写HTML代码

在HTML页面中的元素比较简单，需要一个</code>标签，用来输入留言，一个<code><button></code>标签，用来发表留言，以及一个<code></p><ul></code>标签，用来显示留言的内容。</p><pre><code class="prism language-html"><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>textarea</span><span class="token punctuation">></span></span><span class="token tag"><span class="token tag"><span class="token punctuation"></</span>textarea</span><span class="token punctuation">></span></span><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>button</span><span class="token punctuation">></span></span>发布<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>button</span><span class="token punctuation">></span></span><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>ul</span><span class="token punctuation">></span></span><span class="token tag"><span class="token tag"><span class="token punctuation"></</span>ul</span><span class="token punctuation">></span></span></code></pre><p><noscript><img decoding="async" class="aligncenter" src="https://img.maxssl.com/uploads/?url=https://img-blog.csdnimg.cn/33628b219a154e2ba34a0415b00905b6.png" /></noscript><img decoding="async" class="lazyload aligncenter" src='data:image/svg+xml,%3Csvg%20xmlns=%22http://www.w3.org/2000/svg%22%20viewBox=%220%200%20210%20140%22%3E%3C/svg%3E' data-src="https://img.maxssl.com/uploads/?url=https://img-blog.csdnimg.cn/33628b219a154e2ba34a0415b00905b6.png" /></p><h1>3 编写css代码</h1><p>CSS代码主要对留言板的样式进行一些设置。首先让页面中的外边距和内边距都为0，让留言板靠中心移动一些。</p><pre><code class="prism language-css"><span class="token selector">*</span> <span class="token punctuation">{</span><span class="token property">margin</span><span class="token punctuation">:</span> 0<span class="token punctuation">;</span><span class="token property">padding</span><span class="token punctuation">:</span> 0<span class="token punctuation">;</span><span class="token punctuation">}</span><span class="token selector">body</span> <span class="token punctuation">{</span><span class="token property">padding</span><span class="token punctuation">:</span> 100px<span class="token punctuation">;</span><span class="token punctuation">}</span></code></pre><p><noscript><img decoding="async" class="aligncenter" src="https://img.maxssl.com/uploads/?url=https://img-blog.csdnimg.cn/50950be0e86648d38a00443cf8ad858c.png" /></noscript><img decoding="async" class="lazyload aligncenter" src='data:image/svg+xml,%3Csvg%20xmlns=%22http://www.w3.org/2000/svg%22%20viewBox=%220%200%20210%20140%22%3E%3C/svg%3E' data-src="https://img.maxssl.com/uploads/?url=https://img-blog.csdnimg.cn/50950be0e86648d38a00443cf8ad858c.png" /><br /> 接着设置输入框的属性，设置宽高、边框颜色，轮廓样式以及是否可以改变大小。轮廓就是当<code><textarea></code>聚焦时出现的黑色的边框。</p><pre><code class="prism language-css"><span class="token selector">textarea</span> <span class="token punctuation">{</span><span class="token property">width</span><span class="token punctuation">:</span> 200px<span class="token punctuation">;</span><span class="token property">height</span><span class="token punctuation">:</span> 100px<span class="token punctuation">;</span><span class="token property">border</span><span class="token punctuation">:</span> 1px pink solid<span class="token punctuation">;</span><span class="token comment">/* 不设置轮廓 */</span><span class="token property">outline</span><span class="token punctuation">:</span> none<span class="token punctuation">;</span><span class="token comment">/* 设置其不能改变长宽 */</span><span class="token property">resize</span><span class="token punctuation">:</span> none<span class="token punctuation">;</span><span class="token punctuation">}</span></code></pre><p>设置评论li的样式。这部分设置到现在是看不出效果的，因为目前还没有评论，需要在设置完JavaScript之后搭配动态效果才可以。设置评论的宽度，内边距，背景色，字体大小，外边距，为了让评论更加的好看。</p><pre><code class="prism language-css"><span class="token selector">li</span> <span class="token punctuation">{</span><span class="token property">width</span><span class="token punctuation">:</span> 300px<span class="token punctuation">;</span><span class="token property">padding</span><span class="token punctuation">:</span> 5px<span class="token punctuation">;</span><span class="token property">background-color</span><span class="token punctuation">:</span> #eee<span class="token punctuation">;</span><span class="token property">font-size</span><span class="token punctuation">:</span> 15px<span class="token punctuation">;</span><span class="token property">margin</span><span class="token punctuation">:</span> 15px 0<span class="token punctuation">;</span><span class="token punctuation">}</span></code></pre><p>设置删除的样式。删除使用a标签来设置，将其向右浮动。</p><pre><code class="prism language-css"><span class="token selector">li a</span> <span class="token punctuation">{</span><span class="token property">float</span><span class="token punctuation">:</span> right<span class="token punctuation">;</span><span class="token punctuation">}</span></code></pre><h1>4 编写JavaScript代码</h1><p>在JavaScript部分中，需要为按钮绑定事件。当点击按钮时，如果文本框内没有文字，则弹出提示；如果有文字，则将该文字添加到下方的ul的li中，因此这个过程中需要添加li，并且添加a标签作删除功能，点击删除时删除该li元素。</p><pre><code class="prism language-javascript"><span class="token comment">//1、获取元素</span><span class="token keyword">var</span> txt <span class="token operator">=</span> document<span class="token punctuation">.</span><span class="token function">querySelector</span><span class="token punctuation">(</span><span class="token string">"textarea"</span><span class="token punctuation">)</span><span class="token punctuation">;</span><span class="token keyword">var</span> btn <span class="token operator">=</span> document<span class="token punctuation">.</span><span class="token function">querySelector</span><span class="token punctuation">(</span><span class="token string">"button"</span><span class="token punctuation">)</span><span class="token punctuation">;</span><span class="token keyword">var</span> ul <span class="token operator">=</span> document<span class="token punctuation">.</span><span class="token function">querySelector</span><span class="token punctuation">(</span><span class="token string">"ul"</span><span class="token punctuation">)</span><span class="token punctuation">;</span><span class="token comment">//2、给button绑定点击事件</span>btn<span class="token punctuation">.</span><span class="token function-variable function">onclick</span> <span class="token operator">=</span> <span class="token keyword">function</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span><span class="token keyword">if</span> <span class="token punctuation">(</span>txt<span class="token punctuation">.</span>value <span class="token operator">==</span> <span class="token string">""</span><span class="token punctuation">)</span> <span class="token punctuation">{</span><span class="token comment">//当文本框中没有文字时，提示</span><span class="token function">alert</span><span class="token punctuation">(</span><span class="token string">"您没有输入内容"</span><span class="token punctuation">)</span><span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token punctuation">{</span><span class="token comment">//创建元素li作为留言区</span><span class="token keyword">var</span> li <span class="token operator">=</span> document<span class="token punctuation">.</span><span class="token function">createElement</span><span class="token punctuation">(</span><span class="token string">"li"</span><span class="token punctuation">)</span><span class="token punctuation">;</span><span class="token comment">//将文本框中的内容放到li中,a标签中href中的内容代表什么都不执行</span>li<span class="token punctuation">.</span>innerHTML <span class="token operator">=</span> txt<span class="token punctuation">.</span>value <span class="token operator">+</span> <span class="token string">"删除"</span>txt<span class="token punctuation">.</span>value <span class="token operator">=</span> <span class="token string">""</span><span class="token punctuation">;</span><span class="token comment">//添加之后文本框的内容清空</span><span class="token comment">//将留言添加到ul中，而且在最上方</span>ul<span class="token punctuation">.</span><span class="token function">insertBefore</span><span class="token punctuation">(</span>li<span class="token punctuation">,</span> ul<span class="token punctuation">.</span>children<span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">;</span><span class="token comment">//当点击删除时删除ul中的li</span><span class="token keyword">var</span> <span class="token keyword">as</span> <span class="token operator">=</span> document<span class="token punctuation">.</span><span class="token function">querySelectorAll</span><span class="token punctuation">(</span><span class="token string">"a"</span><span class="token punctuation">)</span><span class="token punctuation">;</span><span class="token comment">//循环给每个删除绑定事件</span><span class="token keyword">for</span> <span class="token punctuation">(</span><span class="token keyword">var</span> i <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span> i <span class="token operator"><</span> <span class="token keyword">as</span><span class="token punctuation">.</span>length<span class="token punctuation">;</span> i<span class="token operator">++</span><span class="token punctuation">)</span> <span class="token punctuation">{</span><span class="token keyword">as</span><span class="token punctuation">[</span>i<span class="token punctuation">]</span><span class="token punctuation">.</span><span class="token function-variable function">onclick</span> <span class="token operator">=</span> <span class="token keyword">function</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span><span class="token comment">//删除当前a标签所在位置的父节点li</span>ul<span class="token punctuation">.</span><span class="token function">removeChild</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>parentNode<span class="token punctuation">)</span><span class="token punctuation">;</span><span class="token punctuation">}</span><span class="token punctuation">}</span><span class="token punctuation">}</span><span class="token punctuation">}</span></code></pre><h1>5 全部代码</h1><pre><code class="prism language-html"><span class="token doctype"><span class="token punctuation"><!</span><span class="token doctype-tag">DOCTYPE</span> <span class="token name">html</span><span class="token punctuation">></span></span><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>html</span> <span class="token attr-name">lang</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>en<span class="token punctuation">"</span></span><span class="token punctuation">></span></span><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>head</span><span class="token punctuation">></span></span><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>meta</span> <span class="token attr-name">charset</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>UTF-8<span class="token punctuation">"</span></span><span class="token punctuation">></span></span><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>meta</span> <span class="token attr-name">http-equiv</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>X-UA-Compatible<span class="token punctuation">"</span></span> <span class="token attr-name">content</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>IE=edge<span class="token punctuation">"</span></span><span class="token punctuation">></span></span><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>meta</span> <span class="token attr-name">name</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>viewport<span class="token punctuation">"</span></span> <span class="token attr-name">content</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>width=device-width, initial-scale=1.0<span class="token punctuation">"</span></span><span class="token punctuation">></span></span><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>title</span><span class="token punctuation">></span></span>Document<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>title</span><span class="token punctuation">></span></span><span class="token tag"><span class="token tag"><span class="token punctuation"></</span>head</span><span class="token punctuation">></span></span><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>style</span><span class="token punctuation">></span></span><span class="token style"><span class="token language-css"><span class="token selector">*</span> <span class="token punctuation">{</span><span class="token property">margin</span><span class="token punctuation">:</span> 0<span class="token punctuation">;</span><span class="token property">padding</span><span class="token punctuation">:</span> 0<span class="token punctuation">;</span><span class="token punctuation">}</span><span class="token selector">body</span> <span class="token punctuation">{</span><span class="token property">padding</span><span class="token punctuation">:</span> 100px<span class="token punctuation">;</span><span class="token punctuation">}</span><span class="token selector">textarea</span> <span class="token punctuation">{</span><span class="token property">width</span><span class="token punctuation">:</span> 200px<span class="token punctuation">;</span><span class="token property">height</span><span class="token punctuation">:</span> 100px<span class="token punctuation">;</span><span class="token property">border</span><span class="token punctuation">:</span> 1px pink solid<span class="token punctuation">;</span><span class="token comment">/* 不设置轮廓 */</span><span class="token property">outline</span><span class="token punctuation">:</span> none<span class="token punctuation">;</span><span class="token comment">/* 设置其不能改变长宽 */</span><span class="token property">resize</span><span class="token punctuation">:</span> none<span class="token punctuation">;</span><span class="token punctuation">}</span><span class="token selector">li</span> <span class="token punctuation">{</span><span class="token property">width</span><span class="token punctuation">:</span> 300px<span class="token punctuation">;</span><span class="token property">padding</span><span class="token punctuation">:</span> 5px<span class="token punctuation">;</span><span class="token property">background-color</span><span class="token punctuation">:</span> #eee<span class="token punctuation">;</span><span class="token property">font-size</span><span class="token punctuation">:</span> 15px<span class="token punctuation">;</span><span class="token property">margin</span><span class="token punctuation">:</span> 15px 0<span class="token punctuation">;</span><span class="token punctuation">}</span><span class="token selector">li a</span> <span class="token punctuation">{</span><span class="token property">float</span><span class="token punctuation">:</span> right<span class="token punctuation">;</span><span class="token punctuation">}</span></span></span><span class="token tag"><span class="token tag"><span class="token punctuation"></</span>style</span><span class="token punctuation">></span></span><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>body</span><span class="token punctuation">></span></span><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>textarea</span><span class="token punctuation">></span></span><span class="token tag"><span class="token tag"><span class="token punctuation"></</span>textarea</span><span class="token punctuation">></span></span><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>button</span><span class="token punctuation">></span></span>发布<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>button</span><span class="token punctuation">></span></span><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>ul</span><span class="token punctuation">></span></span><span class="token tag"><span class="token tag"><span class="token punctuation"></</span>ul</span><span class="token punctuation">></span></span><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>script</span><span class="token punctuation">></span></span><span class="token script"><span class="token language-javascript"><span class="token comment">//1、获取元素</span><span class="token keyword">var</span> txt <span class="token operator">=</span> document<span class="token punctuation">.</span><span class="token function">querySelector</span><span class="token punctuation">(</span><span class="token string">"textarea"</span><span class="token punctuation">)</span><span class="token punctuation">;</span><span class="token keyword">var</span> btn <span class="token operator">=</span> document<span class="token punctuation">.</span><span class="token function">querySelector</span><span class="token punctuation">(</span><span class="token string">"button"</span><span class="token punctuation">)</span><span class="token punctuation">;</span><span class="token keyword">var</span> ul <span class="token operator">=</span> document<span class="token punctuation">.</span><span class="token function">querySelector</span><span class="token punctuation">(</span><span class="token string">"ul"</span><span class="token punctuation">)</span><span class="token punctuation">;</span><span class="token comment">//2、给button绑定点击事件</span>btn<span class="token punctuation">.</span><span class="token function-variable function">onclick</span> <span class="token operator">=</span> <span class="token keyword">function</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span><span class="token keyword">if</span> <span class="token punctuation">(</span>txt<span class="token punctuation">.</span>value <span class="token operator">==</span> <span class="token string">""</span><span class="token punctuation">)</span> <span class="token punctuation">{</span><span class="token comment">//当文本框中没有文字时，提示</span><span class="token function">alert</span><span class="token punctuation">(</span><span class="token string">"您没有输入内容"</span><span class="token punctuation">)</span><span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token punctuation">{</span><span class="token comment">//创建元素li作为留言区</span><span class="token keyword">var</span> li <span class="token operator">=</span> document<span class="token punctuation">.</span><span class="token function">createElement</span><span class="token punctuation">(</span><span class="token string">"li"</span><span class="token punctuation">)</span><span class="token punctuation">;</span><span class="token comment">//将文本框中的内容放到li中,a标签中href中的内容代表什么都不执行</span>li<span class="token punctuation">.</span>innerHTML <span class="token operator">=</span> txt<span class="token punctuation">.</span>value <span class="token operator">+</span> <span class="token string">"删除"</span>txt<span class="token punctuation">.</span>value <span class="token operator">=</span> <span class="token string">""</span><span class="token punctuation">;</span><span class="token comment">//添加之后文本框的内容清空</span><span class="token comment">//将留言添加到ul中，而且在最上方</span>ul<span class="token punctuation">.</span><span class="token function">insertBefore</span><span class="token punctuation">(</span>li<span class="token punctuation">,</span> ul<span class="token punctuation">.</span>children<span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">;</span><span class="token comment">//当点击删除时删除ul中的li</span><span class="token keyword">var</span> <span class="token keyword">as</span> <span class="token operator">=</span> document<span class="token punctuation">.</span><span class="token function">querySelectorAll</span><span class="token punctuation">(</span><span class="token string">"a"</span><span class="token punctuation">)</span><span class="token punctuation">;</span><span class="token comment">//循环给每个删除绑定事件</span><span class="token keyword">for</span> <span class="token punctuation">(</span><span class="token keyword">var</span> i <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span> i <span class="token operator"><</span> <span class="token keyword">as</span><span class="token punctuation">.</span>length<span class="token punctuation">;</span> i<span class="token operator">++</span><span class="token punctuation">)</span> <span class="token punctuation">{</span><span class="token keyword">as</span><span class="token punctuation">[</span>i<span class="token punctuation">]</span><span class="token punctuation">.</span><span class="token function-variable function">onclick</span> <span class="token operator">=</span> <span class="token keyword">function</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span><span class="token comment">//删除当前a标签所在位置的父节点li</span>ul<span class="token punctuation">.</span><span class="token function">removeChild</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>parentNode<span class="token punctuation">)</span><span class="token punctuation">;</span><span class="token punctuation">}</span><span class="token punctuation">}</span><span class="token punctuation">}</span><span class="token punctuation">}</span></span></span><span class="token tag"><span class="token tag"><span class="token punctuation"></</span>script</span><span class="token punctuation">></span></span><span class="token tag"><span class="token tag"><span class="token punctuation"></</span>body</span><span class="token punctuation">></span></span><span class="token tag"><span class="token tag"><span class="token punctuation"></</span>html</span><span class="token punctuation">></span></span></code></pre></article></div><div class="related-posts"><h2 class="related-posts-title"><i class="fab fa-hive me-1"></i>相关文章</h2><div class="row g-2 g-md-3 row-cols-2 row-cols-md-3 row-cols-lg-4"><div class="col"><article class="post-item item-grid"><div class="tips-badge position-absolute top-0 start-0 z-1 m-2"></div><div class="entry-media ratio ratio-3x2"> <a target="" class="media-img lazy bg-cover bg-center" href="https://www.maxssl.com/article/37558/" title="观点：中国应更积极应对Web3.0，让数字经济之路越走越宽广" 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