小程序如何实现折叠菜单 - 好文

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
<view class="cells"> <view class="item" wx:for="{{memberList}}"
wx:for-index="idx" wx:for-item="item" wx:key="idx"> <view bindtap="isOpen"
class="cdn" data-index="{{item.id}}"> <view> <image class="img"
src="{{item.iamges}}" mode="aspectFill"/><text
class="content">{{item.cont}}</text> </view> <view> <text
class="discount">{{item.discount}}</text><image class="icon_img"
src="{{item.hidden ? '/assets/icon_down2x.png' : '/assets/icon_up2x.png'}}"
mode="aspectFill"/> </view> </view> <view hidden="{{item.hiddena}}"
class="hidden"> <block wx:for="{{item.invalidActivty}}" wx:for-index="index"
wx:for-item="items" wx:key="index"> <view class="buys"> <view class="v1 ">
<navigator><text class="new-price">{{items.price}}</text><text
class="oldPrice">{{items.oldPrice}}</text></navigator> <navigator><text
class="buy">{{items.validType}}</text><text style="font-size:
24rpx;margin-left: 20rpx;color: #6C6C6C">{{items.validTime}}</text></navigator>
</view> <view class="shopping"> <text>购买</text> </view> </view> </block>
</view> </view> </view>
.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; },

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