[Bug Report] Menu state is not saved

[Deemetr]

Element UI version

2.3.3

OS/Browsers version

Chrome 65.0.3325.181

Vue version

2.5.16

Reproduction Link

https://jsfiddle.net/deemetr/eywraw8t/23943/

Steps to reproduce

1. Click on "expand" button
2. Select node "Navigation One\item four\item one"
3. Click on button "collapse"
4. Click on button "expand"

What is Expected?

The node from step №2 still selected

What is actually happening?

Navbar state set to default

[alek5ey]

I have the same problem

[iPhosgen]

I face this bug too

[d3en9]

+1

[qingwufengyang]

怎么解决