[bug report] cascader style still shows the last bound value status

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#18,669 opened on Jan 10, 2020 12 comments 0 reactions 0 assignees View on GitHub

Description

![element-cascader-bug](https://user-images.githubusercontent.com/18066675/72146490-83c60780-33d7-11ea-8c39-51b29abd9f8b.gif)

### Element UI version
2.13.0

### OS/Browsers version
windows/Google Chrome79.0.3945.88

### Vue version
2.6.10

### Reproduction Link
https://codepen.io/xlong1029/pen/jOExNMv

### Steps to reproduce
Cascader第二次绑定值时，下拉框里选项高亮样式仍显示上一次绑定值时的状态

### What is Expected?
应根据当前传入的值来显示对应高亮样式

### What is actually happening?
Cascader第二次传入值时，下拉框里选项高亮样式仍显示上一次传入值时的状态

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