The scope of the [bug report] table component may not be isolated

### Element UI version
2.13.0

### OS/Browsers version
MacOS/Chrome

### Vue version
2.6.11

### Reproduction Link
https://codepen.io/matinjugou/pen/abvbwQJ

### Steps to reproduce
点击左边的Table2，再点击Table1就会发现Table1的数据错乱了

### What is Expected?
Table1和Table2各自正常显示自己的数据

### What is actually happening?
Table1的表格数据被Table2干扰了，name列按照Table2的address的逻辑来显示的