小程序实例：小程序实现折叠菜单的效果（附代码）

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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：

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;    },

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