change the style from line to bar. added some backend code
Merge branch 'master' of github.com:gaoyuankidult/Keyword-APP
Merge branch 'master' of github.com:gaoyuankidult/Keyword-APP
Merge branch 'master' of github.com:gaoyuankidult/Keyword-APP
Merge branch 'master' of github.com:gaoyuankidult/Keyword-APP
Merge branch 'master' of github.com:gaoyuankidult/Keyword-APP
Merge branch 'master' of github.com:gaoyuankidult/Keyword-APP
Merge branch 'master' of github.com:gaoyuankidult/Keyword-APP
Merge branch 'master' of github.com:gaoyuankidult/Keyword-APP
Merge branch 'master' of github.com:gaoyuankidult/Keyword-APP
Merge branch 'master' of github.com:gaoyuankidult/Keyword-APP
Merge branch 'master' of github.com:gaoyuankidult/Keyword-APP
Merge branch 'master' of github.com:gaoyuankidult/Keyword-APP
Merge branch 'master' of github.com:gaoyuankidult/Keyword-APP
Merge branch 'master' of github.com:gaoyuankidult/Keyword-APP
Merge branch 'master' of github.com:gaoyuankidult/Keyword-APP
Merge branch 'master' of github.com:gaoyuankidult/Keyword-APP
Merge branch 'master' of github.com:gaoyuankidult/Keyword-APP
Merge branch 'master' of github.com:gaoyuankidult/Keyword-APP
Merge branch 'master' of github.com:gaoyuankidult/Keyword-APP