The summary-method method of the [Bug Report] Table component will be called many times

[rossroma]

Element UI version

1.4.2

OS/Browsers version

macOS X 10.12

Vue version

2.4.2

Reproduction Link

https://jsfiddle.net/tjom473L/1/

Steps to reproduce

1.打开重现链接，然后打开浏览器的控制台
2.刷新页面，查看控制台输出，这时会显示 summary-method 方法被触发的次数

What is Expected?

该方法被调用一次即可

What is actually happening?

经实际测试，该方法被触发的次数为 table行数的3-5倍，当数据量比较多时，会有性能问题

[element-bot]

Translation of this issue:

Element UI version

1.4.2

OS/Browsers version

MacOS X 10.12

Vue version

2.4.2

Reproduction Link

https://jsfiddle.net/tjom473L/

Steps to reproduce

1. open the link again, and then open the browser's console

2. refresh the page and view the console output, which will show the number of times the summary-method method was triggered

What is Expected?

The method is called once

What is actually happening?

The actual test shows that the number of times the method is triggered is 3-5 times the number of table rows, and when the amount of data is relatively long, the performance problems will arise

[Leopoldthecoder]

Duplicate of #6276