fix: displayIndex 0

修复：遗漏displayIndex等于0的情况
one is all

tow "m_pTween = NULL;"
Merge pull request #131 from yinqiang/patch-3

one is all
Merge pull request #130 from yinqiang/patch-2

fix: displayIndex 0
Merge pull request #19 from dualface/master

Merge from dualface:master