add toTopBtn to console log in task page

Signed-off-by: miaojian <kitemao@gmail.com>
Merge remote-tracking branch 'wandou/master'
remove console.log

Signed-off-by: miaojian <kitemao@gmail.com>
polish toTopBtn class

Signed-off-by: miaojian <kitemao@gmail.com>
polish toTopBtn logic

Signed-off-by: miaojian <kitemao@gmail.com>
Merge pull request #26 from kitemao/master

add toTopBtn to console log in task page