<div class="imagemap">
  <img width="500" height="350" src="test.jpg">
</div>

<div class="imagemap">
  <img width="500" height="350" src="test.jpg">
  <ul>
    <li class="baidu">
      <a href="https://www.baidu.com" target="_blank">
        <span class="note">百度</span>
      </a>
    </li>
    <li class="tengxun">
      <a href="https://www.qq.com" target="_blank">
        <span class="note">腾讯</span>
      </a>
    </li>
    <li class="xinlang">
      <a href="https://www.sina.com.cn" target="_blank">
        <span class="note">新浪</span>
      </a>
    </li>
    <li class="taobao">
      <a href="https://www.taobao.com" target="_blank">
        <span class="note">淘宝</span>
      </a>
    </li>
    <li class="jd">
      <a href="https://www.jd.com" target="_blank">
        <span class="note">京东</span>
      </a>
    </li>
  </ul>
</div>

.imagemap {
  width: 500px;
  height: 350px;
  position: relative;
}

.imagemap ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.imagemap a {
  position: absolute;
  /*转为块级元素，这样可以形成一块区域*/
  display: block;
  width: 50px;
  height: 60px;
  text-decoration: none;
}

.imagemap .baidu a {
  top: 70px;
  left: 65px;
}

.imagemap .tengxun a {
  top: 85px;
  left: 150px;
}

.imagemap .xinlang a {
  top: 70px;
  left: 230px;
}

.imagemap .taobao a {
  top: 70px;
  left: 305px;
}

.imagemap .jd a {
  top: 70px;
  left: 365px;
}

/*鼠标滑过的时候，显示一个方框*/
.imagemap a:hover {
  border: 1px solid white;
}

.imagemap a .note {
  position: absolute;
  top: -2em;
  left: -100em;
  background-color: #42b983;
  color: white;
  width: 2em;
  text-align: center;
  padding: 0.2em 0.5em;
  border-radius: 5px;
}

.imagemap a:hover .note {
  left: 0;
}