[Bug Report] el-table setting type=selection,el-checkbox no response on safari 9.0 System。Hope to get back to you as soon as possible

### Element UI version
2.14.1

### OS/Browsers version
Safari9.0

### Vue version
2.5.13

### Reproduction Link
https://codepen.io/YiXueQing/pen/qBapNxd

### Steps to reproduce
Click the multiple box in the list to check no response; the multiple box in div cannot be checked

### What is Expected?
Normal selection and cancellation of multiple chexkbox

### What is actually happening?
No response from multiple chexkbox