Merge pull request #116 from xieyu33333/develop

handle merge error
Merge pull request #117 from xieyu33333/develop

remove console
Merge branch 'develop'
Merge pull request #118 from xieyu33333/develop

完善注释&修改readme
Merge branch 'develop'
code format
Merge pull request #119 from xieyu33333/develop

fix overSpread bug
handle conflict
change demo js
set offset origin value