微信小程序实现左侧滑动导航栏

<!-- 左侧滚动栏 -->
<view class='under_line'></view>
<view style='float: left' class='left'>
 <scroll-view scroll-y scroll-with-animation scroll-left="{{scrollLength}}" class='scrollY' style='height: {{winHeight}}px'>
 <view class='all clear'>
 <block wx:key="lists" wx:for="{{lists}}">
 <view bindtap='jumpIndex' data-menuindex='{{index}}'>
 <view class='text-style'>
 <text class="{{indexId==index?'active1':''}}">{{item}}</text>
 <text class="{{indexId==index?'active':''}}"></text>
 </view>
 </view>
 </block>
 </view>
 </scroll-view>
</view>

.under_line{
 width: 100%;
 border-top: 1rpx solid #efefef;
}
.scrollY {
 width: 200rpx;
 position: fixed;
 left: 0;
 top: 0;
 border-right: 1rpx solid #efefef;
}
 
.left {
 border-top: 1rpx solid #efefef;
 border-right: 1rpx solid #efefef;
}
 
.text-style {
 width: 200rpx;
 height: 140rpx;
 line-height: 140rpx;
 text-align: center;
 font-size: 34rpx;
 font-family: PingFangSC-Semibold;
 color: rgba(51, 51, 51, 1);
}
 
.active1 {
 color: #85d1fd;
}
 
.active {
 display: block;
 width: 50rpx;
 height: 6rpx;
 background: #85d1fd;
 position: relative;
 left: 75rpx;
 bottom: 30rpx;
}

Page({
 
 /**
 * 页面的初始数据
 */
 data: {
 lists: [
 "标题1", "标题二", "标题三", "标题四", "标题五", "标题六", "标题七", "标题八", "标题九", "标题十", "标题十一", "标题十二"
 ],
 indexId: 0,
 },
 // 左侧点击事件
 jumpIndex(e) {
 let index = e.currentTarget.dataset.menuindex
 let that = this
 that.setData({
 indexId: index
 });
 },
 /**
 * 生命周期函数--监听页面加载
 */
 onLoad: function(options) {
 var that = this
 wx.getSystemInfo({
 success: function(res) {
 that.setData({
 winHeight: res.windowHeight
 });
 }
 });
 },
 
 /**
 * 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() {
 
 }
})