回答

有两种方式

一、scroll-into-view

<scroll-view scroll-y scroll-into-view='{{toView}}' style='height: 440px;overflow: auto; '>
  <view id="msg-1">1</view>  <view id="msg-2">2</view></scroll-view>

二、scrolltop

设置

<scroll-view scroll-y :scroll-top="scrollTop" id="scrollview" style="400px;overflow: scroll; '">
    <view id="msglistview"><view>1</view>  <view>2</view></view></scroll-view>

js来计算scrolltop并setdata

let that = this
		            let query = uni.createSelectorQuery()
		            query.select('#scrollview').boundingClientRect()
		            query.select('#msglistview').boundingClientRect()
		            query.exec((res) => {
		                // console.log(res)
		                if(res[1].height > res[0].height){
		                    that.scrollTop = res[1].height - res[0].height;
							console.log(  that.scrollTop );
		                }
		            })