兼容老版本android不能返回的问题

@@ -5,7 +5,7 @@
         <layout-body>
             <header-box slot="header" class="home-header">
                 <span slot="left">
-                    <i class="icon icon-back go-back-btn" @click="goBack"></i>
+                    <i class="icon icon-back go-back-btn" v-if="showBack" @click="goBack"></i>
                 </span>
                 <span slot="title" class="logo">
 
@@ -54,14 +54,15 @@ export default {
         return {
             homeSlider: false,
             searchSlider: false,
-            loadComponent: false
+            loadComponent: false,
+            showBack: false
         };
     },
     asyncData({store}) {
         return store.dispatch(FETCH_HOME_REQUEST);
     },
     computed: {
-        ...mapState(['channel'])
+        ...mapState(['channel', 'yoho'])
     },
     methods: {
         homeSliderSwitch() {
@@ -121,6 +122,22 @@ export default {
         ResourceBox
     },
     async mounted() {
+        if (this.yoho.env.isAndroid) {
+            let appVersion = this.$cookie.get('app_version');
+
+            if (appVersion && typeof appVersion === 'string') {
+                let versions = appVersion.split('.');
+
+                if (versions.length === 3 &&
+                    (+versions[0] > 6 ||
+                    (+versions[0] === 6 && +versions[1] > 5) ||
+                    (+versions[0] === 6 && +versions[1] === 5 && +versions[2] > 1))) {
+                    this.showBack = true;
+                }
+            }
+        } else {
+            this.showBack = true;
+        }
         setTimeout(() => {
             this.loadComponent = true;
             this.$store.dispatch(FETCH_CHANNEL_REQUEST, {gender: 'men'});