[Bug Report] row-class-name repeatedly executes multiple questions

[javadoge]

Element UI version

2.4.10

OS/Browsers version

win7

Vue version

2.5.17

Reproduction Link

https://jsfiddle.net/javadoge/ea02stjg/4/#

Steps to reproduce

运行代码，debugger调试即可看到效果，row-class-name 事件重复执行了多次

What is Expected?

table多少条纪录row-class-name事件就执行多少次

What is actually happening?

row-class-name重复执行了很多次

[element-bot]

Translation of this issue:

Element UI version
2.4.10

OS/Browsers version
Win7

Vue version
2.5.17

Reproduction Link
https://jsfiddle.net/javadoge/ea02stjg/4/#

Steps to reproduce
Run code, debugger debug can see the effect, row-class-name event repeatedly executed many times.

What is Expected?
Table how many records do row-class-name events execute?

What is actually happening?
Row-class-name has been executed many times.

[ziyoung]

#10588 (comment)