关闭应用时，没有获取环境导致报错

src/pages/index/index.vue

@@ -595,6 +595,7 @@ export default {
       // this.getUserInfo()
     },
     toCloseApp() {
+      let platform = uni.getSystemInfoSync().platform.toLocaleLowerCase()
       if (platform == 'ios') {
         //ios使用原来的quit()方法失效
         plus.ios.import("UIApplication").sharedApplication().performSelector("exit")