[Bug Report] el-date-picker[type=week]: `value-format` invalidation of `format`
Open
component: date-picker
next major candidate
status: discussion
- Dominant language
- Vue
- Stars
- 54k
- Forks
- 14.4k
- PR merge metrics
- No merged PRs in 30d
Description
### Element UI version
2.0.7
### OS/Browsers version
windows10 chrome63.0.3239.84（正式版本） （64 位）
### Vue version
2.5.2
### Reproduction Link
[https://jsfiddle.net/bowencool/ndkdwyka/1/](https://jsfiddle.net/bowencool/ndkdwyka/1/)
### Steps to reproduce
见链接
### What is Expected?
正常展示就行
### What is actually happening?
不能正常展示数据
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Assessment
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