这篇文章将为大家详细讲解有关js如何实现下拉菜单效果，小编觉得挺实用的，因此分享给大家做个参考，希望大家阅读完这篇文章后可以有所收获。
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效果图：
代码如下：
*{
margin: 0;
padding: 0;
}
body {
width: 460px;
margin: 0 auto;
font-family: "微软雅黑";
}
.search{
height: 23px;
line-height: 23px;
border-bottom: 1px solid #d4d4d4;
font-weight: 600;
}
.search img{
float: left;
display: inline-block;
margin-top: 5px;
}
.search span{
float: left;
font-size: 14px;
margin-left: 4px;
}
.content1{
height: 254px;
width: 100%;
background: #f5f5f5;
border-top: 1px solid #eaeaea;
padding-top: 10px;
}
.content1 .content1_div{
width: 90%;
height: 43px;
margin: 5px auto;
}
.left{
width: 30%;
height: 43px;
border: 1px solid #eaeaea;
font-size: 14px;
text-align: center;
line-height: 43px;
float: left;
}
.right{
width: 68%;
height:43px;
border: 1px solid #eaeaea;
font-size: 14px;
text-align: center;
line-height: 43px;
float: left;
background: #fff;
margin-left: 3px;
}
.right .right_select{
display: inline-block;
width: 90%;
height: 20px;
border: none;
border: 1px solid #a4bed4;
text-align: center;
direction: center;
}
.right_select option{
text-align: center;
}
.hecha{
text-align: center;
margin-top: 15px;
}
.jdcxx{
height: 146px;
font-size: 14px;
background: #ebebeb;
background-size:cover;
padding-top: 20px;
}
.jdcxx p,.jdcsyrxx p{
margin-left: 20px;
font-weight: 600;
line-height: 33.6px;
font-size: 14px;
}
.jdcxx .xx,.jdcsyrxx .xx{
font-weight: 100;
}
.jdcsyrxx{
margin-top: 20px;
padding-top: 20px;
height: 146px;
font-size: 20px;
background:#ebebeb;
background-size:cover;
}
.hcr,.hcsj{
height: 30px;
font-size: 14px;
line-height: 30px;
border-bottom: 1px solid #d4d4d4;
}
.hcr_left{
display: block;
float: left;
height: 28px;
width: 2px;
margin-top: 1px;
background: #226ed2;
}
.zc{
width: 100px;
display: block;
float: left;
text-align: right;
margin-left: 10px;
margin-right: 10px;
}
.xm,.sj{
font-weight: 600;
}
.xiala_div{
top: 33px;
display: none;
z-index: 600;
border: 1px solid #A4BED4;
width: 253px;
left: 13px;
}
.xiala_input{
line-height: 21px;
width: 253px;
border: none;
outline: none;
margin: 0;
text-align: center;
cursor: default;
background: #fff;
color: #000;
}
.xiala_input:hover{
background: #a4bed4;
}
