js控制伪元素样式

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//获取伪元素
// CSS代码 2 #myId:before { 3 content: "hello world!"; 4 display: block; 5 width: 100px; 6 height: 100px; 7 background: red; 8 } 9 // HTML代码 10 <div id="myId"></div> 11 // JS代码 12 var myIdElement = document.getElementById("myId"); 13 var beforeStyle = window.getComputedStyle(myIdElement, ":before"); 14 console.log(beforeStyle); // [CSSStyleDeclaration Object] 15 console.log(beforeStyle.width); // 100px 16 console.log(beforeStyle.getPropertyValue("width")); // 100px 17 console.log(beforeStyle.content); // "hello world!
//更改样式:
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// CSS代码 2 .red::before { 3 content: "red"; 4 color: red; 5 } 6 .green::before { 7 content: "green"; 8 color: green; 9 } 10 // HTML代码 11 <div class="red">内容内容内容内容</div> 12 // jQuery代码 13 $(".red").removeClass('red').addClass('green');

 

posted @ 2018-06-14 22:12  前端极客  阅读(6921)  评论(0编辑  收藏  举报