Improve excanvas2
Improve excanvas2

songshuang00/zrender,noikiy/zrender,armslave00/zrender,coderstudy/zrender,ilovezy/zrender,lkiarest/zrender,powy1993/zrender,nagyistoce/ecomfe-zrender,elancom/zrender,dato-code/zrender,laomu1988/zrender,stanleyxu2005/zrender,lkiarest/zrender,uooo/zrender,uooo/zrender,ChaosPower/zrender,powy1993/zrender,KnightBubble/zrender,skyujilong/zrender,jl9n/zrender,ilovezy/zrender,armslave00/zrender,dato-code/zrender,ekinwei/zrender,powy1993/zrender,ChaosPower/zrender,ecomfe/zrender,KnightBubble/zrender,skyujilong/zrender,IveWong/zrender,nagyistoce/ecomfe-zrender,elancom/zrender,dasmond/zrender,dasmond/zrender,ekinwei/zrender,laomu1988/zrender,noikiy/zrender,ecomfe/zrender,stanleyxu2005/zrender,ecomfe/zrender,songshuang00/zrender,IveWong/zrender,coderstudy/zrender,jl9n/zrender