CSS uses pseudo-selectors to make arrow icons_html/css_WEB-ITnose

 1 <section class="main"> 2     <header class="title">图标变形过渡效果缩放式菜单</header> 3     <section> 4         <button>图标</button> 5         <header> 6  #300x100 淡色系  7         </header> 8         <div> 9             <article>10                 <img src="http://www.gbtags.com/gb/laitu/300x100" alt="" />11             </article>12         </div>13     </section>14     <section>15         <button>图标</button>16         <header>17  #300x100 暗色系 18         </header>19         <div>20             <article>21                 <img src="http://www.gbtags.com/gb/laitu/300x100/666666/ffffff" alt="" />22             </article>23         </div>24     </section>25 </section>

 1 * { box-sizing:border-box;} 2 body { font-family: 'microsoft yahei',Arial,sans-serif; background: #aaa;} 3 section { position: relative; width:100%;} 4 section.main { position: absolute; top:10%; left:25%; width:50%; max-width:30em; min-width:15em; border-radius:5px; overflow: hidden;} 5 section.main > header { background: orange; color:#fff; line-height: 1.2em; text-align: center;} 6 section section:last-child { border:none;} 7 section > div { height:0; overflow: hidden; transition:all .4s ease-in-out;} 8 article,header { padding:1em; line-height: 1em;} 9 header:not(.title) { width:100%; overflow: hidden; height:3em; background: #efefef; cursor:pointer; color:#888; white-space:nowrap; text-overflow: ellipsis; padding-right: 2.1em;}10 header:not(.title):hover { background: #e8e8e8;}11 article { line-height: 1.4em; background: rgba(255, 255, 255, .7);}12 article img { width:100%; height:auto; border:2px solid white; border-radius: 3px;}13 14 /* 使用CSS3的伪选择器,生成关闭和向下两个图标按钮; */15 /* 使用变形属性,组合位移和旋转,可将生成的小矩形组合成向下按钮,同样也可以组装成关闭按钮; */16 section button { position: absolute; right:0; margin:0; padding:0; height:3em; width:3em; outline:none; border:0; background: none; text-indent: -9999px; pointer-events:none; cursor:pointer;}17 section button:before, 18 section button:after { content:''; display: block; position: absolute; width:4px; height:12px; background: orange; border-radius: .3em; top:50%; left:50%; transition:all .3s ease-in-out;}19 20 /*向左箭头*/21 /*section button:before { transform:translate(0%, -50%) rotate(45deg);} 22 section button:after { transform:translate(0%, 0%) rotate(-45deg);}*/23 24 /*向右箭头*/25 /*section button:before { transform:translate(0%, -50%) rotate(-45deg);} 26 section button:after { transform:translate(0%, 0%) rotate(45deg);}*/27 28 /*向上箭头*/29 /*section button:before { transform:translate(75%, -20%) rotate(-45deg);} 30 section button:after { transform:translate(-75%, -20%) rotate(45deg);}*/31 32 /*向下箭头*/33 section button:before { transform:translate(75%, 0%) rotate(45deg);} 34 section button:after { transform:translate(-75%, 0%) rotate(-45deg);}35 36 37 /* 点击之后需要变成"X"; */38 section.open button:after,section.open button:before { background: red; height:14px; }39 section.open button:before { transform:translate(-75%, -20%) rotate(45deg);}40 section.open button:after { transform:translate(-75%, -20%) rotate(-45deg);}

 1 $(function(){ 2     $('section section header').on('click', function () { 3         var $this = $(this), 4             parent_section = $this.parent(), 5             closeDiv = $this.siblings('div'), 6             contentheight = closeDiv.children('article').outerHeight(); 7         (closeDiv.height() === 0 ) ? closeDiv.height(contentheight) : closeDiv.height(0);    8         // 更改容器高度; 9         $this.parents('section').first().toggleClass('open');10         // 更改箭头样式;11     });12 });