Update util.js (#4700)
Update util.js (#4700)

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