html

<!-- #ifdef MP-WEIXIN || APP-PLUS -->
<view class="tc  header":style="topBarHeight() == 0 ? '' : 'height:' + topBarHeight() + 'px;padding-top:' + topBarTop() + 'px'"><view class="reg180" :style="topBarHeight() == 0 ? '' : 'height:' + topBarHeight() + 'px;'"><image @click="goback" src="/static/icon/back-jianatou.png" mode="" style="width: 48rpx;height: 48rpx;"></image></view></view>
<!-- #endif -->

js

goback() {let routes = getCurrentPages(); // 获取当前打开过的页面路由数组console.log(routes.length);if (routes.length <= 1) {this.gotoPage('/pages/index/index');} else {uni.navigateBack();}},

css

.reg180 {padding-right: 20rpx;text-align: center;transform: rotateY(180deg);display: flex;justify-content: flex-end;align-items: center;}.header {z-index: 99;position: fixed;height: 30px;line-height: 30px;top: 0;left: 0;width: 100%;padding-top: var(--status-bar-height);}.header .reg180 .icon-jiantou {color: #ffffff;background: rgba($color: #000000, $alpha: 0.6);display: block;width: 44rpx;height: 44rpx;line-height: 44rpx;border-radius: 50%;}

最后

感觉文章好的话记得点个心心和关注和收藏，有错的地方麻烦指正一下，如果需要转载,请标明出处，多谢！！！