fix raf bind in IE9
fix raf bind in IE9

KingMario/vue,KingMario/vue,Jinjiang/vue,Ddder-FE/vue,optimizely/vue,Jinjiang/vue,greennyreborn/vue,Ddder-FE/vue,xueyaodeai/vue,cnchanning/vue,Hanks10100/vue,Ddder-FE/vue,leemotive/vue,Hanks10100/vue,greennyreborn/vue,leemotive/vue,Hanks10100/vue,xueyaodeai/vue,Kingwl/vue,Hanks10100/vue,vuejs/vue,lizhiyao/vue,xueyaodeai/vue,KingMario/vue,lizhiyao/vue,KingMario/vue,greennyreborn/vue,vuejs/vue,Jinjiang/vue,lizhiyao/vue,leemotive/vue,xueyaodeai/vue,lizhiyao/vue,Kingwl/vue,Jinjiang/vue,leemotive/vue,greennyreborn/vue,Ddder-FE/vue,vuejs/vue,cnchanning/vue,cnchanning/vue,Kingwl/vue,Kingwl/vue,vuejs/vue