{
 "pages":[
  "views/views",
  "views/navigators/navigator1/navigator1",
  "views/navigators/navigator2/navigator2",
  "views/navigators/navigator3/navigator3",
  "pages/index/index",
  "pages/logs/logs"
 ],
 "window":{
  "backgroundTextStyle":"light",
  "navigationBarBackgroundColor": "#fff",
  "navigationBarTitleText": " 下拉列表测试",
  "navigationBarTextStyle":"black"
 }
}

Page({
 data:{
  // text:"这是一个页面"
  open:false
 },
 showitem:function(){
   this.setData({
     open:!this.data.open
   })
 },
 onLoad:function(options){
  // 页面初始化 options为页面跳转所带来的参数
 },
 onReady:function(){
  // 页面渲染完成
 },
 onShow:function(){
  // 页面显示
 },
 onHide:function(){
  // 页面隐藏
 },
 onUnload:function(){
  // 页面关闭
 }
})

<view class="page">
  <view class="page_bd">
    <view class="body_head" bindtap="showitem">点击我显示下拉列表</view>
    <navigator url="../views/navigators/navigator1/navigator1"><view class="{{open">列表1</view></navigator>
    <navigator url="../views/navigators/navigator2/navigator2"><view class="{{open">列表2</view></navigator>
    <navigator url="../views/navigators/navigator3/navigator3"><view class="{{open">列表3</view></navigator>
  </view>
</view>

.page_bd{
  padding: 10px;
  background-color: snow;
}
.body_head{
  border: 1px solid;
  border-color: beige;
  padding: 10px;
}
.display_show{
  display: block;
  border: 1px solid;
  border-color: beige;
  padding: 10px;
}
.display_none{
  display: none;
}