Element UI version

2.14.1

OS/Browsers version

windows/chrome

Vue version

2.6.10

Reproduction Link

https://codepen.io/privatenine/pen/poExOQR

Steps to reproduce

when click nav until nav is disabled, but "is-disabled" class is not suit with state

What is Expected?

when click nav until nav is disabled, "is-disabled" class is correct

What is actually happening?

when click nav until nav is disabled, "is-disabled" class is incorrect