加入Waterfall元素的null check

src/components/Film.vue

@@ -485,7 +485,9 @@ export default {
       if (this.view === 'Film') {
         this.getAllSites()
         if (this.setting.view === 'picture') {
-          this.$refs.filmWaterfall.refresh()
+          if (this.$refs.filmWaterfall) {
+            this.$refs.filmWaterfall.refresh()
+          }
           this.getPage().then(() => {
             this.infiniteId += 1
           })
@@ -567,7 +569,7 @@ export default {
         this.show.class = true
         this.searchContents = []
         this.show.find = false
-        if (this.setting.view === 'picture') {
+        if (this.setting.view === 'picture' && this.$refs.filmWaterfall) {
           this.$refs.filmWaterfall.refresh()
         }
       }

src/components/History.vue

@@ -156,7 +156,9 @@ export default {
     view () {
       this.getAllhistory()
       this.getAllsites()
-      this.$refs.historyWaterfall.refresh()
+      if (this.$refs.historyWaterfall) {
+        this.$refs.historyWaterfall.refresh()
+      }
     }
   },
   methods: {

src/components/Recommendation.vue

@@ -197,7 +197,9 @@ export default {
     view () {
       if (this.view === 'Recommendation') {
         this.getRecommendations()
-        this.$refs.recommendataionsWaterfall.refresh()
+        if (this.$refs.recommendataionsWaterfall) {
+          this.$refs.recommendataionsWaterfall.refresh()
+        }
       }
     },
     sortKeyword () {

src/components/Star.vue

@@ -192,7 +192,9 @@ export default {
       if (this.view === 'Star') {
         this.getAllsites()
         this.getFavorites()
-        this.$refs.starWaterfall.refresh()
+        if (this.$refs.starWaterfall) {
+          this.$refs.starWaterfall.refresh()
+        }
       }
     },
     numNoUpdate () {