SOURCE

<div class="dropdown">
    <li><a href="#"><button class="dropbtn">首页</button></a></li>
  <div class="dropdown-content">
    <a href="http://www.hezhiming.cn/#jcxs">畅销书</a>
    <a href="http://www.hezhiming.cn/#jcxs">促销书</a>
    <a href="http://www.hezhiming.cn/#jcxs">热门书</a>
	  
	  
  </div>
</div>
	<div class="dropdown">
    <li><a href="#"><button class="dropbtn">调查</button></a></li>
  <div class="dropdown-content">
    <a href="https://wenku.baidu.com/view/4fea24cada38376baf1fae94.html?from=search">好评</a>
    <a href="https://wenku.baidu.com/view/101d3e45a26925c52cc5bfde.html?from=search">留言</a>
    <a href="https://wenku.baidu.com/view/c7ba02896529647d272852b0.html?from=search">建议</a>
	  
	  
  </div>
</div>
	<div class="dropdown">
    <li><a href="#"><button class="dropbtn">分析</button></a></li>
  <div class="dropdown-content">
    <a href="http://www.runoob.com">客户分析</a>
    <a href="http://www.runoob.com">市场分析</a>
    <a href="http://www.runoob.com">内部分析</a>
	  
	  
  </div>
</div>
	<div class="dropdown">
    <li><a href="#"><button class="dropbtn">下单</button></a></li>
  <div class="dropdown-content">
    <a href="http://www.runoob.com">菜鸟教程 1</a>
    <a href="http://www.runoob.com">菜鸟教程 2</a>
    <a href="http://www.runoob.com">菜鸟教程 3</a>

.dropbtn {
    background-color: #4CAF50;
    color: white;
    padding: 16px;
    font-size: 16px;
    border: none;
    cursor: pointer;
}

.dropdown {
    position: relative;
    display: inline-block;
}

.dropdown-content {
    display: none;
    position: absolute;
    background-color: #f9f9f9;
    min-width: 160px;
    box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
}

.dropdown-content a {
    color: black;
    padding: 12px 16px;
    text-decoration: none;
    display: block;
}

.dropdown-content a:hover {background-color: #f1f1f1}

.dropdown:hover .dropdown-content {
    display: block;
}

.dropdown:hover .dropbtn {
    background-color: #3e8e41;
}
</style>