safety intreface

@@ -71,6 +71,13 @@ const yoho = {
       return callback();
     }
   },
+  safetyInterface(callback) {
+    if (this.deviceready) {
+      return callback();
+    } else {
+      this.ready(callback);
+    }
+  },
 
   /**
      * 跳转至指定index的tab(从0开始)
@@ -700,5 +707,8 @@ const yoho = {
   },
 };
 
+yoho.ready(() => {
+  yoho.deviceready = true;
+});
 
 export default yoho;

@@ -67,7 +67,9 @@ export default {
   methods: {
     onBack() {
       if (this.yoho.homePage) {
+        this.$yoho.safetyInterface(() => {
           this.$yoho.finishPage({});
+        });
       } else {
         this.$router.go(-1);
       }