小程序如何实现折叠菜单

通常，菜单都有一级菜单二级、三级菜单之分，我们知道前端js的dom操作可以很好的控制二级菜单的显示与隐藏，当然今天我就不介绍web端的菜单折叠效果。我今天呢，是来学习学习小程序中该如何实现点击一级菜单显示/隐藏二级菜单，并且在点击一个菜单显示之外，要实现其他菜单隐藏。

实现效果如下：

 

代码如下：

   .wxml文件

    
        
            
                {{item.cont}}
            
            
                {{item.discount}}
            
        
        
    

.wxss文件如下：

page{
    background: #fff;
}
.swiper-img{
    width: 750rpx;
    height: 300rpx;
}
.cells .item .cdn{
    position: relative;
    box-sizing:border-box;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20rpx 30rpx;
    /*border-bottom: 1rpx solid #f0f0f0;*/
    background-color: #fff;
    font-size: 32rpx;
}
.cells .item .cdn::after{
    content:'';position:absolute;top:0;left:0;width:200%;height:200%;-webkit-transform:scale(.5);transform:scale(.5);-webkit-transform-origin:0 0;transform-origin:0 0;pointer-events:none;box-sizing:border-box;border-bottom:0 solid #f0f0f0;border-width:1px
}

.img{
    height: 44rpx;
    width: 44rpx;
    vertical-align: middle;
    display: inline-block;
    line-height: 82rpx;
}

.icon_img{
    height:12rpx;
    width:20rpx;
}



.content{
    margin-left: 15rpx;
    line-height: 82rpx;
    vertical-align: middle;
}

.discount{
    line-height: 82rpx;
    vertical-align: middle;
    color:orange;
    box-sizing: border-box;
    padding-right: 20rpx;
}


.video-item{
    display: flex;
    flex-direction: column;
}
.buys{
    width:750rpx;
    height: 141.6rpx;
    position: relative;
    box-sizing: border-box;
    padding: 20rpx 30rpx;
    display: flex;
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
    background-color:#FAFAFA;
}
.buys::after {
    content:'';position:absolute;top:0;left:0;width:200%;height:200%;-webkit-transform:scale(.5);transform:scale(.5);-webkit-transform-origin:0 0;transform-origin:0 0;pointer-events:none;box-sizing:border-box;
    border-bottom:0 solid #DCDCDC;border-width:1px;
}
.v1{
    width: 35%;
    display: flex;
    flex-direction: row;
    flex-wrap: wrap;
}

.new-price{
    font-size: 32rpx;
    color: #3B3B3B;
}
.oldPrice{
    text-decoration:line-through;
    font-size: 24rpx;
    color: #B0B0B0;
    margin-left: 20rpx;
}
.buy{
    font-size: 24rpx;
    color: #2DAF73;
    text-align: center;
    width: 80rpx;
    height: 40rpx;
    line-height: 40rpx;
    display: inline-block;
    position: relative;
    box-sizing: border-box;
}
.buy::after{
    content:'';position:absolute;top:0;left:0;width:200%;height:200%;-webkit-transform:scale(.5);transform:scale(.5);-webkit-transform-origin:0 0;transform-origin:0 0;pointer-events:none;box-sizing:border-box;border:0 solid #2DAF73;border-width:1px;border-radius:8rpx
}

.shopping{
    width: 128rpx;
    height: 56rpx;
    line-height: 56rpx;
    position: relative;
    box-sizing: border-box;
    font-size: 28rpx;
    color: #2DAF73;
    text-align: center;
}
.shopping::after{
    content:'';position:absolute;top:0;left:0;width:200%;height:200%;-webkit-transform:scale(.5);transform:scale(.5);-webkit-transform-origin:0 0;transform-origin:0 0;pointer-events:none;box-sizing:border-box;border:0 solid #2DAF73;border-width:1px;border-radius:16rpx
}

.js文件

data: {
    memberList:[
        {iamges:"/assets/logo_aiqiyi2x.png",
          cont:"爱奇艺影视会员",
          discount:"7.5折",
          hiddena:true,
          id:"0",
          invalidActivty:[
            {
              price:"2.98元",
              oldPrice:"3元",
              validType:"周卡",
              validTime:'7天有效'
            },
            {
                price:"18.98元",
                oldPrice:"25元",
                validType:"月卡",
                validTime:'30天有效'
            },
          ]
        },
        {iamges:"/assets/logo_tengxun2x.png",
            cont:"腾讯视频会员",
            discount:"7折",
            hiddena:true,
            id:"1",
            invalidActivty:[
                {
                    price:"2.98元",
                    oldPrice:"3元",
                    validType:"周卡",
                    validTime:'7天有效'
                },
                {
                    price:"18.98元",
                    oldPrice:"25元",
                    validType:"月卡",
                    validTime:'30天有效'
                },
            ]
        },
        {iamges:"/assets/logo_youku2x.png",
            cont:"优酷视频黄金会员",
            discount:"8折",
            hiddena:true,
            id:"2",
            invalidActivty:[
                {
                    price:"2.98元",
                    oldPrice:"3元",
                    validType:"周卡",
                    validTime:'7天有效'
                },
                {
                    price:"18.98元",
                    oldPrice:"25元",
                    validType:"月卡",
                    validTime:'30天有效'
                },
            ]
        },
        {iamges:"/assets/logo_sohu2x.png",
            cont:"搜狐视频黄金会员",
            discount:"8折",
            hiddena:true,
            id:"3",
            invalidActivty:[
                {
                    price:"2.98元",
                    oldPrice:"3元",
                    validType:"周卡",
                    validTime:'7天有效'
                },
                {
                    price:"18.98元",
                    oldPrice:"25元",
                    validType:"月卡",
                    validTime:'30天有效'
                },
            ]
        },
    ]
  },
  isOpen:function(e){
      var that = this;
      var idx = e.currentTarget.dataset.index;
      console.log(idx);
      var memberList = that.data.MemberList;
      console.log(memberList);
      for (let i=0; i < memberList.length; i++){
          if (idx == i) {
              memberList[i].hidden=!memberList[i].hidden;
          } else {
             memberList[i].hidden=true;
          }
      }
      this.setData({MemberList:memberList});
      return true;
    },

有用就给个赞呗！

腾讯云服务器安全可靠高性能，多种配置供您选择
https://cloud.tencent.com/redirect.php?redirect=1001&cps_key=8ee0f9c89dfe0958071ea9b77e110670&from=console

淘宝优惠券： http://tq.xinrtd.com
京东优惠券： http://jp.xinrtd.com