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el-popper 不能跟随页面滚动

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el-popper 不能跟随页面滚动

一个项目中发现cascader的选择器dom el-popper 不能跟随页面滚动，
其内联样式absolute定位的top不跟随页面滚动。
image.png

手上另一个项目的 el-popper是跟随页面滚动的，对比了一下前端框架，也没有发现问题。

请问我应该怎么着手解决这个问题？


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绝对定位按父元素定位.
之前可以跟随应该是放在了一个开启定位的的父元素下,所以可以跟随.

修改方案如下

  1. 将poper移到滚动部分下.(比如list在body中滚动,就移动到list下)
  2. 滚动部分开启定位.

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