[Bug Report] 在IE11上NavMenu导航菜单的数量超过200个菜单的时候折叠特别的卡顿!
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- Dominant language
- Vue
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- 54k
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Description
### Element UI version
2.14.0
### OS/Browsers version
Windows 10/IE11
### Vue version
2.6.10
### Reproduction Link
https://jsfiddle.net/mmx38qxw/
### Steps to reproduce
重现链接的网站都不支持IE11,没法贴测试代码
### What is Expected?
解决IE11的兼容性问题
### What is actually happening?
IE11上菜单数量超过200个折叠功能特别的卡顿
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