三（奇数）等分两者中间有间隔，两端没间隔_html/css_WEB-ITnose

1.三等分

采用box-sizing:border-box;然后分别给他们赋值你想要的百分比，左边和上边加上border或者padding，本实例采用的是padding，因为样式1，样式二总共分为两层所有用百分比更加合适，最后给他们的父元素添加个margin-left:-间隔大小；让左右两边的间隔不会出现大小不一样。

<div class="cards cards-1/2/3">    <ul class="cardlist clearfix">                                            <li>            <a href="tuniuapp://travel/discover/new_community/tag_list" style="background-image:url(/image/one.jpeg)"></a>        </li>                                                                            <li>            <a href="tuniuapp://travel/discover/new_community/group_list" style="background-image:url(/image/one.jpeg)"></a>        </li>                                                                            <li>            <a href="tuniuapp://travel/discover/new_community/post_detail?post_id=13883" style="background-image:url(/image/one.jpeg)"></a>        </li>                                    </ul></div>

三种样式

.banner .cards .cardlist{  padding: 23% 10px 10px 10px;  margin-left: -1%;}.banner .cards .cardlist li{  float: left;  padding-top:1%;  padding-left:1%;  width:33.333%;  box-sizing:border-box;}.banner .cards .cardlist li a{  background-repeat: no-repeat;  background-size: cover;}.banner .cards-1 .cardlist li a{  display: block;  width: 100%;  padding-top: 48.5%;}.banner .cards-1 .cardlist li:nth-child(1) a{  display: block;  width: 100%;  padding-top: 100%;}.banner .cards-2 .cardlist li:nth-child(1),.banner .cards-2 li:nth-child(2){  width:50%;}.banner .cards-2 .cardlist li a{  display: block;  width: 100%;  padding-top: 40%;}.banner .cards-3 .cardlist li a{  display: block;  width: 100%;  padding-top: 100%;}