给大家分享一个微信小程序页面返回顶部的效果，具体内容如下：
1、wxml代码

<scroll-view scroll-y scroll-with-animation='true' scroll-top='{{ topNum }}'>
	 <view>1</view>
	 <view>1</view>
	 <view>1</view>
	 <view>1</view>
	 <view>1</view>
	 <view>1</view>
	 <view>1</view>
	 <view>1</view>
	 <view>1</view>
	 <view>1</view>
</scroll-view>

<view class='top' catchtap='returnTop'>顶部</view>

2、js代码

Page({
 data: {
  topNum: 0
 },

 returnTop: function () {
  this.setData({
   topNum: this.data.topNum = 0
  });
 }
})

3、wxss代码

page{
 width: 100%;
 height: 100%;
}
scroll-view{
 height: 100%;
 width: 100%;
}
view{
 width: 100%;
 height: 200px;
 text-align: center;
 line-height: 200px;
 font-weight: 600;
}
view:nth-child(odd){
 background-color: red;
}
.top{
 width: 50px;
 height: 50px;
 position: fixed;
 right: 10px;
 bottom: 10px;
 z-index: 1;
 background-color: yellow;
 color: red;
 text-align: center;
 line-height: 50px;
}

以上就是页面返回顶部的全部内容，希望对大家有所帮助。