[Bug Report] Pagination, the different order of size-change in update:pageSize will cause different results

[HannibalKcc]

Element UI version

2.4.6

OS/Browsers version

win10 / chorme 67.0.3396.99

Vue version

2.5.16

Reproduction Link

https://jsfiddle.net/mmx38qxw/5364/

Steps to reproduce

1, change pageSize
2, check console.log

What is Expected?

when I change pageSize,i can get pageSize is consistent with the results on the interface

What is actually happening?

get pageSize is last value

[HannibalKcc]

I had checked code, and i found the problem is here.
just change order line208、line209 can fix this bug.
You can confirm it from here: codesandBox