tslint error fixed
tslint error fixed

NativeScript/NativeScript,NativeScript/NativeScript,NativeScript/NativeScript,NativeScript/NativeScript,hdeshev/NativeScript,hdeshev/NativeScript,genexliu/NativeScript,hdeshev/NativeScript,NativeScript/NativeScript,genexliu/NativeScript,genexliu/NativeScript