* feat(scroll): add pullUpLoad subprops visible

* feat(scroll): enhance forceUpdate

* chore(scroll): update docs and test

* optimise(scroll): using nextElementSubling

* chore(docs): update scroll doc

* chore(unit): update unit test to improve coverage

* chore: fix scroll docs

* feat(checker): new component checker

* test(checker): init checker test

* refactor(demo): add checker

* docs(checker): init checker docs

* refactor(checker): remove console

* test(checker): fix radio test

* fix(checker): radio & checkbox type active condition

* fix(checker): radio condition error

* refactor(example): checker router component path err

* test(checker): fix test

* add checker disabled

* add checker disabled document

* 修改checker文档

* 修改缩进

* 修改test

* docs(checkbox and checkbox-group): add events

* docs(components of form type): add input event documentation

* docs(rate component): modify documents

* docs(components of form type): modify events description

* docs(input): modify events description