一淘九宫格的面试题

by redky

HTML

<div class="box">
    <ul>
        <li><a href=""><span class="helper"></span><span class="text">1</span></a></li>
        <li><a href=""><span class="helper"></span><span class="text">2</span></a></li>
        <li><a href=""><span class="helper"></span><span class="text">3</span></a></li>
        <li><a href=""><span class="helper"></span><span class="text">4</span></a></li>
        <li><a href=""><span class="helper"></span><span class="text">5</span></a></li>
        <li><a href=""><span class="helper"></span><span class="text">6</span></a></li>
        <li><a href=""><span class="helper"></span><span class="text">7</span></a></li>
        <li><a href=""><span class="helper"></span><span class="text">8</span></a></li>
        <li><a href=""><span class="helper"></span><span class="text">9</span></a></li>
    </ul>
</div>

CSS

* {
  margin: 0;
  padding: 0;
}
.box {
  padding: 5px 0 0 5px;
  background-color: blue;
  overflow: hidden;
  width: 165px;
  height: 165px;
  margin: 0 auto;
}
ul {
  width: 200px;
}
.box li {
  float: left;
  width: 50px;
  height: 50px;
  line-height: 50px;
  text-align: center;
  margin-right: 5px;
  margin-bottom: 5px;
  list-style: none;
  background-color: #fff;
  position: relative;
}
a {
  text-decoration: none;
}

.text {
  position: absolute;
  left: 0;
  top: 0;
  z-index: 2;
  width: 100%;
  height: 100%;
  background-color: #fff;
}
.helper {
  position: absolute;
  left: 0;
  top: 0;
  width: 60px;
  height: 60px;
  margin-top: -5px;
  margin-left: -5px;
}
a:hover .helper {
  background: red;
  z-index: 1;
}