微信小程序怎么实现内容的展开和收起

就是以上效果，废话不多说，上代码wxml:

<view class='list_box' wx:for='{{list}}' wx:key='this' wx:for-item='parentItem' wx:for-index='parentIndex' ><view class='list'><view class='list_name_box' catchtap='listTap' data-parentindex='{{parentIndex}}'><text class='list_item_name'>{{parentItem.listName}}</text><image src='/img/down.png' class='icon_down {{parentItem.show&&"icon_down_rotate"}}'></image></view><view class='list_item_box' wx:if='{{parentItem.show}}'><view class='list_item' wx:for='{{parentItem.item}}' wx:key='this' catchtap='listItemTap' data-index='{{index}}'  data-parentindex='{{parentIndex}}'><view class='list_item_name_box'><text class='list_item_name'>{{item.itemName}}</text><image src='/img/down.png' class='icon_down {{item.show&&"icon_down_rotate"}}'></image></view><view class='other_box' wx:if='{{item.show}}'><view class='other'><text class='other_title'>内容：</text><text class='other_text'>{{item.content}}</text></view><view class='other'><text class='other_title'>时间：</text><text class='other_text'>{{item.time}}</text></view></view></view></view></view></view>

然后wxss:

page{background: #f3f7f7;}.list_name_box{background: #fff;border-bottom: 1px solid #efefef;display: flex;height: 90rpx;align-items: center;padding: 0 25rpx;font-size: 32rpx;}.list_item_name{flex: 1;}.icon_down{width: 35rpx;height:35rpx;transition:transform  0.3s;}/* .list_item_box{height: 0;transition:height  0.3s;overflow: hidden;}.list_item_box_show{height: 500rpx;} */.list_item_name_box{background: #fff;font-size: 30rpx;height: 80rpx;display: flex;align-items: center;padding: 0 25rpx 0 50rpx;}.other{display: flex;height: 80rpx;padding: 0 25rpx 0 50rpx;align-items: center;font-size: 30rpx;color: #666;}.icon_down_rotate{transform:rotate(180deg);}

JS:

// pages/dome/dome.jsPage({/*** 页面的初始数据*/data: {list:[{listName:'列表1',item:[{itemName:'子列表1-1',content:'1-1中的内容',time: '2015-05-06'}, {itemName: '子列表1-2',content: '1-2中的内容',time: '2015-04-13'}, {itemName: '子列表1-3',content: '1-3中的内容',time: '2015-12-06'}]},{listName: '列表2',item: [{itemName: '子列表2-1',content: '2-1中的内容',time: '2017-05-06'}, {itemName: '子列表2-2',content: '2-2中的内容',time: '2015-08-06'}, {itemName: '子列表2-3',content: '2-3中的内容',time: '2015-11-06'}]}, {listName: '列表3',item: [{itemName: '子列表3-1',content: '3-1中的内容',time: '2015-05-15'}, {itemName: '子列表3-2',content: '3-2中的内容',time: '2015-05-24'}, {itemName: '子列表1-3',content: '3-3中的内容',time: '2015-05-30'}]}]},//点击最外层列表展开收起listTap(e){console.log('触发了最外层');let Index = e.currentTarget.dataset.parentindex,//获取点击的下标值list=this.data.list;list[Index].show = !list[Index].show || false;//变换其打开、关闭的状态if (list[Index].show){//如果点击后是展开状态，则让其他已经展开的列表变为收起状态this.packUp(list,Index);}this.setData({list    });},//点击里面的子列表展开收起listItemTap(e){let parentindex = e.currentTarget.dataset.parentindex,//点击的内层所在的最外层列表下标Index=e.currentTarget.dataset.index,//点击的内层下标list=this.data.list;console.log(list[parentindex].item,Index);list[parentindex].item[Index].show = !list[parentindex].item[Index].show||false;//变换其打开、关闭的状态if (list[parentindex].item[Index].show){//如果是操作的打开状态，那么就让同级的其他列表变为关闭状态，保持始终只有一个打开for (let i = 0, len = list[parentindex].item.length;i<len;i++ ){if(i!=Index){list[parentindex].item[i].show=false;}}}this.setData({list});},//让所有的展开项，都变为收起packUp(data,index){for (let i = 0, len = data.length; i < len; i++) {//其他最外层列表变为关闭状态if(index!=i){data[i].show = false;for (let j=0;j<data[i].item.length;j++){//其他所有内层也为关闭状态data[i].item[j].show=false;}}}},onLoad: function (options) {},/*** 生命周期函数--监听页面初次渲染完成*/onReady: function () {},/*** 生命周期函数--监听页面显示*/onShow: function () {},/*** 生命周期函数--监听页面隐藏*/onHide: function () {},/*** 生命周期函数--监听页面卸载*/onUnload: function () {},/*** 页面相关事件处理函数--监听用户下拉动作*/onPullDownRefresh: function () {},/*** 页面上拉触底事件的处理函数*/onReachBottom: function () {},/*** 用户点击右上角分享*/onShareAppMessage: function () {}})作者：链接：https://www.imooc.com/article/30662来源：慕课网本文原创发布于慕课网 ，转载请注明出处，谢谢合作