在B站上看到个不错的小特效，自己模仿者写了一下，触发事件都很明了了，大家一看就会明白的
效果如下：
<!DOCTYPE html><html> <head> <meta charset="UTF-8"> <title>shade box</title> <style type="text/css"> * { margin: 0px; padding: 0px; box-sizing: border-box; font-family: 'Microsoft Yahei'; font-size: 14px; } nav { width: 500px; margin: 10px auto; } .nav { list-style: none; } .nav li { float: left; margin: 0px 5px; } .nav_element { position: relative; } /*过度时间为0.5s*/ .shade { position: absolute; left: 0px; top: 0px; transition: 0.5s; width: 0px; height: 20px; border-radius: 5px 5px; /* 遮罩起始宽度为0 溢出隐藏*/ overflow: hidden; z-index: 1; visibility: hidden; } /*外廓事先已经画好 只是以为父容器宽度为0溢出隐藏不可视而已*/ .outer { position: absolute; left: 0px; top: 0px; width: 60px; height: 20px; border: 1px solid #00a1d6; border-radius: 20px 20px; } /*z-index -1 让外廓可以覆盖此边线*/ .content { border:1px solid #ccc; width: 60px; height: 20px; border-radius: 20px 20px; text-align: center; line-height: 20px; background-color: #fff; position: relative; z-index: -1; } </style> </head> <body> <nav> <ul> <li> <div onmouseover="showOuter(this)" onmouseout="hideOuter(this)"> <div> <div></div> </div> <p>首页</p> </div> </li> <li> <div onmouseover="showOuter(this)" onmouseout="hideOuter(this)"> <div> <div></div> </div> <p>视频</p> </div> </li> <li> <div onmouseover="showOuter(this)" onmouseout="hideOuter(this)"> <div> <div></div> </div> <p>新闻</p> </div> </li> <li> <div onmouseover="showOuter(this)" onmouseout="hideOuter(this)"> <div> <div></div> </div> <p>画廊</p> </div> </li> <li> <div onmouseover="showOuter(this)" onmouseout="hideOuter(this)"> <div> <div></div> </div> <p>直播</p> </div> </li> <li> <div onmouseover="showOuter(this)" onmouseout="hideOuter(this)"> <div> <div></div> </div> <p>One</p> </div> </li> <li> <div onmouseover="showOuter(this)" onmouseout="hideOuter(this)"> <div> <div></div> </div> <p>Enge</p> </div> </li> </ul> <script type="text/javascript"> //获取某导航元素的遮罩子元素 修改其宽度 function showOuter(nav_element) { var shade = nav_element.getElementsByClassName('shade')[0]; shade.style.visibility = 'visible'; shade.style.width = '60px'; } function hideOuter(nav_element) { var shade = nav_element.getElementsByClassName('shade')[0]; shade.style.visibility = 'hidden'; shade.style.width = '0px'; } </script> </nav> </body></html> 
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mPDF is a PHP library that can generate PDF files from UTF-8 encoded HTML. The original author, Ian Back, wrote mPDF to output PDF files "on the fly" from his website and handle different languages. It is slower than original scripts like HTML2FPDF and produces larger files when using Unicode fonts, but supports CSS styles etc. and has a lot of enhancements. Supports almost all languages, including RTL (Arabic and Hebrew) and CJK (Chinese, Japanese and Korean). Supports nested block-level elements (such as P, DIV),
