Add "thisObject" parameter for gui.Alert.show
Add "thisObject" parameter for gui.Alert.show

Add "thisObject" parameter for gui.Alert.show method, to avoid errors
caused by "this" keyword

jarvys/egret-hacking,Lanfei/egret-core,unsilence/egret-core,jiangzhonghui/egret-core,SamuelGavin/egret-core,jarvys/egret-hacking,Lanfei/egret-core,SamuelGavin/egret-core,SmallAiTT/egret-core,unsilence/egret-core,jiangzhonghui/egret-core,wl3780/egret-core,wisdomsword/egret-core,SmallAiTT/egret-core,wisdomsword/egret-core,wl3780/egret-core