微信小程序下拉菜单效果的实例代码

//wcss
/**DropDownMenu**/
 
/*总菜单容器*/
 
.menu {
 display: block;
 height: 28px;
 position: relative;
}
 
/*一级菜单*/
 
.menu dt {
 font-size: 15px;
 float: left;
 /*hack*/
 width: 33%;
 height: 38px;
 border-right: 1px solid #d2d2d2;
 border-bottom: 1px solid #d2d2d2;
 text-align: center;
 background-color: #f4f4f4;
 color: #5a5a5a;
 line-height: 38px;
 z-index: 2;
}

/*二级菜单外部容器样式*/
.menu dd {
 position: absolute;
 width: 100%;
 margin-top: 40px;
 left: 0;
 z-index: -99;
}
/*二级菜单普通样式*/
.menu li {
 font-size: 14px;
 line-height: 34px;
 color: #575757;
 height: 34px;
 display: block;
 padding-left: 8px;
 background-color: #fff;
 border-bottom: 1px solid #dbdbdb;
}
/*二级菜单高亮样式*/
.menu li.highlight {
 background-color: #f4f4f4;
 color: #48c23d;
}
/* 显示与隐藏 */
.show {
 /*display: block;*/
 visibility: visible;
}
.hidden {
 /*display: none;*/
 visibility: hidden;
}
//wxml 

  
   
{{menuItem.reportType}}
   

    

     
{{chilItem.Name}}
    
     时间：{{dateValue}}
   
  

//js
//数据源
var ReportDataSync = [
  {
    reportType: "日报1",
    chilItem: [
      { ID: 1, Name: "日报1", ReportUrl: "DailyReport.aspx", Type: 1 },
      { ID: 2, Name: "日报2", ReportUrl: "DailyReport.aspx", Type: 1 },
      { ID: 3, Name: "日报3", ReportUrl: "DailyReport.aspx", Type: 1 }]
  },
  {
    reportType: "目录2",
    chilItem: [
      { ID: 1, Name: "目录1", ReportUrl: "DailyReport.aspx", Type: 2 },
      { ID: 2, Name: "目录2", ReportUrl: "DailyReport.aspx", Type: 2 },
      { ID: 3, Name: "目录3", ReportUrl: "DailyReport.aspx", Type: 2 },
      { ID: 4, Name: "目录4", ReportUrl: "DailyReport.aspx", Type: 2 }]
  },
  {
    reportType: "月报3",
    chilItem: [
      { ID: 1, Name: "月报1", ReportUrl: "DailyReport.aspx", Type: 1 },
      { ID: 2, Name: "月报2", ReportUrl: "DailyReport.aspx", Type: 2 }]
  }
]
//定义字段
var initSubMenuDisplay = [] 
var initSubMenuHighLight = []
var initAnimatiOnData= []
/// 初始化DropDownMenu
loadDropDownMenu()
that.setData({
  reportData: ReportDataSync,//菜单数据
  subMenuDisplay: initSubMenuDisplay, //一级
  subMenuHighLight: initSubMenuHighLight, //二级
   animationData: initAnimationData //动画
})
//一级菜单点击
tapMainMenu: function (e) {
  //获取当前一级菜单标识
  var index = parseInt(e.currentTarget.dataset.index);
  //改变显示状态
  for (var i = 0; i 
/// 初始化DropDownMenu
/// 1.一级目录 initSubMenuDisplay ：['hidden']
/// 2.二级目录 initSubMenuHighLight ：[['',''],['','','','']]]
/// 
function loadDropDownMenu() {
  for (var i = 0; i