update README.md
update README.md
Update README.md
remove file
update README.md
ie
command
undo
undo manager
undo
fix typo
undo
Merge pull request #42 from winwu/master

fix typo
modify js
Merge pull request #43 from winwu/master

modify js
undo
undo
rename element
remove unused variables
update component.json