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css中伪类元素:before及:after用法浅谈
JS代码:
<!DOCTYPE html> <html> <head> <meta charset="utf-8" /> <title></title> <style> *{ margin: 0; padding: 0; } .wrap{ margin-top: 10px; width: 150px; padding: 10px; position: relative; } .wrap span:nth-of-type(1){ vertical-align: bottom; display: inline-block; border: 1px solid black; padding: 10px; transition: 0.5s; } .wrap span:nth-of-type(2){ height: 17px; vertical-align: bottom; display: inline-block; padding: 10px; padding-left: 100px; border-bottom: 1px solid black; transition: 0.5s; } .wrap span:nth-of-type(3){ display: inline-block; position: absolute; left: 50px; top: 22px; } </style> </head> <body> <div class="wrap" id="wrap"> <span>?</span><span></span><span> Read More</span> </div> </body> <script> var oDiv = document.getElementById("wrap"); var Span1 = document.getElementsByTagName("span")[0]; var Span2 = document.getElementsByTagName("span")[1]; var Span3= document.getElementsByTagName("span")[2]; oDiv.onmouseover = function(){ oDiv.style.color ="red"; Span1.style.borderColor="red"; Span1.style.transform="rotateX(180deg)"; Span2.style.borderColor="red"; Span2.style.transform="rotateX(180deg)"; oDiv.onmouseout = function(){ oDiv.style.color =""; Span1.style.borderColor=""; Span1.style.transform=""; Span2.style.borderColor=""; Span2.style.transform=""; } } </script> </html>
无JS,用伪类编辑的css代码
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title></title> <style type="text/css"> * { margin: 0; padding: 0; } .sp:hover{ color: red; } .sp:hover:before, .sp:hover:after { color: red; transform: rotateX(180deg); border-color: red; } .sp:before { transition:0.5s; padding: 10px; content: ‘?‘; border: 1px solid black; display: inline-block; } .sp:after { content: ‘ ‘; width: 80px; transition:0.5s; padding: 19px; position: relative; top: 14px; left: -96px; border-bottom: 1px solid black; display: inline-block; } </style> </head> <body> <div class="wrap" id="wrap"> <span class="sp"> Read More</span> </div> </body> </html>
效果:
css中伪类元素:before及:after用法浅谈
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