[New Feature] scroll组件的forceUpdate方法，期望增加参数，用于区别本次操作是针对上拉还是下拉
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enhancement
- Dominant language
- JavaScript
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Description
### What problem does this feature solve?
当上拉和下拉都处于loading状态时，如果调用forceUpdate，会只处理下拉的情况而忽略上拉，因为该方法使用的是if..else if...来判断。
希望增加参数，来让使用者区分。
### What does the proposed API look like?
Contributor guide
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