我设计了一个简单有趣的包含Gravatar头像的登录框功能，头像是基于邮件id从gravatar.com导出的。这篇文章是非常基本的层面上的CSS实现和几行Jquery和PHP代码。我希望这个登录框设计对您的web项目给出了一些特殊的味道。在尝试这个示例前请在Gravatar上先上传你的头像.
498)this.width=498;' onmousewheel = 'javascript：return big(this)' title="使用PHP、jQuery和CSS制作gravatar头像登录窗" height="300" alt="使用PHP、jQuery和CSS制作gravatar头像登录窗" src="https://lh3.googleusercontent.com/-RFUV0LFAAbo/T7vN5VAW8tI/AAAAAAAAGCU/W8cbVtFpbko/s550/loginbox.png" width="550" />
使用PHP、jQuery和CSS制作gravatar头像登录窗
JavaScript
包含javascript代码。$(".user").keyup(function(){}---user是input标签的名字，我们通过$(this).val()获取input的值。如果email值通过了正则表达式，ajax将会请求avatar.php
<ol class="dp-c">
<li class="alt"><span><span><script><span class="string">"text/javascript"</script></span><span> src=</span><span class="string">"http://ajax.googleapis.com/ajax/libs/jquery/1.6.2/jquery.min.js"</span><span>> </span></span></li>
<li>
<span><script><span class="string">"text/javascript"</script></span><span> > </span>
</li>
<li class="alt">
<span>$(document).ready(</span><span class="keyword">function</span><span>() </span>
</li>
<li><span>{ </span></li>
<li class="alt">
<span>$(</span><span class="string">"#username"</span><span>).focus(); </span>
</li>
<li>
<span>$(</span><span class="string">".user"</span><span>).keyup(</span><span class="keyword">function</span><span>() </span>
</li>
<li class="alt"><span>{ </span></li>
<li>
<span class="keyword">var</span><span> email=$(</span><span class="keyword">this</span><span>).val(); </span>
</li>
<li class="alt">
<span class="keyword">var</span><span> dataString = </span><span class="string">'email='</span><span>+ email ; </span>
</li>
<li>
<span class="keyword">var</span><span> ck_email = /^([w-]+(?:.[w-]+)*)@((?:[w-]+.)*w[w-]{0,66}).([a-z]{2,6}(?:.[a-z]{2})?)$/i; </span>
</li>
<li class="alt"><span> </span></li>
<li>
<span class="keyword">if</span><span>(ck_email.test(email)) </span>
</li>
<li class="alt"><span>{ </span></li>
<li><span>$.ajax({ </span></li>
<li class="alt">
<span>type: </span><span class="string">"POST"</span><span>, </span>
</li>
<li>
<span>url: </span><span class="string">"avatar.php"</span><span>, </span>
</li>
<li class="alt"><span>data: dataString, </span></li>
<li>
<span>cache: </span><span class="keyword">false</span><span>, </span>
</li>
<li class="alt">
<span>success: </span><span class="keyword">function</span><span>(html) </span>
</li>
<li><span>{ </span></li>
<li class="alt">
<span>$(</span><span class="string">"#img_box"</span><span>).html(</span><span class="string">"<img alt="PHP、jQ和CSS制作头像登录窗" ><span>+html+</span><span class="string">"?d=mm' />"</span><span>); </span></span>
</li>
<li><span>} </span></li>
<li class="alt"><span>}); </span></li>
<li><span>} </span></li>
<li class="alt"><span> </span></li>
<li><span>}); </span></li>
<li class="alt"><span>}); </span></li>
<li><span> </span></li>
</ol>498)this.width=498;' onmousewheel = 'javascript：return big(this)' title="使用PHP、jQuery和CSS制作gravatar头像登录窗" height="322" alt="使用PHP、jQuery和CSS制作gravatar头像登录窗" src="https://lh6.googleusercontent.com/-S5T-tywC_QU/T7vffdMlKHI/AAAAAAAAGCk/Fz445g_QAdY/s368/wire.png" width="368" />
使用PHP、jQuery和CSS制作gravatar头像登录窗
HTML 代码
<ol class="dp-xml"> <li class="alt"><span><span class="tag"><span class="tag-name">div</span><span> </span><span class="attribute">id</span><span>=</span><span class="attribute-value">"login_container"</span><span class="tag">></span><span> </span></span></span></li> <li><span class="tag"><span class="tag-name">div</span><span> </span><span class="attribute">id</span><span>=</span><span class="attribute-value">"login_box"</span><span class="tag">></span><span> </span></span></li> <li class="alt"><span class="tag"><span class="tag-name">div</span><span> </span><span class="attribute">id</span><span>=</span><span class="attribute-value">"img_box"</span><span class="tag">></span><span class="tag"><span class="tag-name">img</span><span> </span><span class="attribute">src</span><span>=</span><span class="attribute-value">"http://www.gravatar.com/avatar/?d=mm"</span><span> </span><span class="attribute">alt</span><span>=</span><span class="attribute-value">""</span><span> </span><span class="tag">/></span><span class="tag"></span><span class="tag-name">div</span><span class="tag">></span><span> </span></span></span></li> <li><span class="tag"><span class="tag-name">form</span><span> </span><span class="attribute">action</span><span>=</span><span class="attribute-value">"login.php"</span><span> </span><span class="attribute">method</span><span>=</span><span class="attribute-value">"post"</span><span class="tag">></span><span class="tag"><span class="tag-name">input</span><span> </span><span class="attribute">id</span><span>=</span><span class="attribute-value">"username"</span><span> </span><span class="attribute">class</span><span>=</span><span class="attribute-value">"input user"</span><span> </span><span class="attribute">type</span><span>=</span><span class="attribute-value">"text"</span><span> </span><span class="tag">/></span><span> </span><span class="tag"><span class="tag-name">input</span><span> </span><span class="attribute">id</span><span>=</span><span class="attribute-value">"password"</span><span> </span><span class="attribute">class</span><span>=</span><span class="attribute-value">"input passcode"</span><span> </span><span class="attribute">type</span><span>=</span><span class="attribute-value">"password"</span><span> </span><span class="tag">/></span><span> </span><span class="tag"><span class="tag-name">input</span><span> </span><span class="attribute">class</span><span>=</span><span class="attribute-value">"btn"</span><span> </span><span class="attribute">type</span><span>=</span><span class="attribute-value">"submit"</span><span> </span><span class="attribute">value</span><span>=</span><span class="attribute-value">" Login "</span><span> </span><span class="tag">/></span><span class="tag"></span><span class="tag-name">form</span><span class="tag">></span><span class="tag"></span><span class="tag-name">div</span><span class="tag">></span><span> </span></span></span></span></span></li> <li class="alt"> <span class="tag"></span><span class="tag-name">div</span><span class="tag">></span><span> </span> </li> </ol>
avatar.php
这里包含了十分简单的代码：接收POST过来的email，进行md5加密，返回加密后数据即可。
<ol class="dp-c">
<li class="alt"><span><span><?php </span></span></span></li>
<li>
<span class="keyword">if</span><span>(</span><span class="vars">$_POST</span><span>[</span><span class="string">'email'</span><span>]) </span>
</li>
<li class="alt"><span>{ </span></li>
<li>
<span class="vars">$email</span><span>=</span><span class="vars">$_POST</span><span>[</span><span class="string">'email'</span><span>]; </span>
</li>
<li class="alt">
<span class="vars">$lowercase</span><span> = </span><span class="func">strtolower</span><span>(</span><span class="vars">$email</span><span>); </span>
</li>
<li>
<span class="vars">$image</span><span> = md5(</span><span class="vars">$lowercase</span><span>); </span>
</li>
<li class="alt">
<span class="func">echo</span><span> </span><span class="vars">$image</span><span>; </span>
</li>
<li><span>} </span></li>
<li class="alt"><span>?> </span></li>
</ol>CSS
<ol class="dp-css">
<li class="alt"><span><span class="value">#login</span><span>_container </span></span></li>
<li><span>{ </span></li>
<li class="alt">
<span class="keyword">background</span><span>:</span><span class="value">url</span><span>(</span><span class="value">blue</span><span>.jpg) </span><span class="value">#006699</span><span>; </span>
</li>
<li>
<span class="keyword">overflow</span><span>: </span><span class="value">auto</span><span>; </span>
</li>
<li class="alt">
<span class="keyword">width</span><span>: </span><span class="value">300px</span><span>; </span>
</li>
<li><span>} </span></li>
<li class="alt">
<span class="value">#login</span><span>_box </span>
</li>
<li><span>{ </span></li>
<li class="alt">
<span class="keyword">padding</span><span>:</span><span class="value">60px</span><span> </span><span class="value">30px</span><span> </span><span class="value">30px</span><span> </span><span class="value">30px</span><span>; </span>
</li>
<li>
<span class="keyword">border</span><span>:</span><span class="value">solid</span><span> </span><span class="value">1px</span><span> </span><span class="value">#dedede</span><span>; </span>
</li>
<li class="alt">
<span class="keyword">width</span><span>:</span><span class="value">238px</span><span>; </span>
</li>
<li>
<span class="keyword">background-color</span><span>:</span><span class="value">#fcfcfc</span><span>; </span>
</li>
<li class="alt">
<span class="keyword">margin-top</span><span>:</span><span class="value">70px</span><span>; </span>
</li>
<li><span>} </span></li>
<li class="alt">
<span class="value">#img</span><span>_box </span>
</li>
<li><span>{ </span></li>
<li class="alt">
<span class="keyword">background-color</span><span>: </span><span class="value">#FFFFFF</span><span>; </span>
</li>
<li>
<span class="keyword">border</span><span>: </span><span class="value">1px</span><span> </span><span class="value">solid</span><span> </span><span class="value">#DEDEDE</span><span>; </span>
</li>
<li class="alt">
<span class="keyword">margin-left</span><span>: </span><span class="value">77px</span><span>; </span>
</li>
<li>
<span class="keyword">margin-top</span><span>: </span><span class="value">-108px</span><span>; </span>
</li>
<li class="alt">
<span class="keyword">position</span><span>: </span><span class="value">absolute</span><span>; </span>
</li>
<li>
<span class="keyword">width</span><span>: </span><span class="value">86px</span><span>; </span>
</li>
<li class="alt">
<span class="keyword">height</span><span>: </span><span class="value">86px</span><span>; </span>
</li>
<li><span>} </span></li>
</ol>
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
