js实现下拉菜单效果

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;
 }
  
  
  


 

 
  
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