fix bug

@@ -34,26 +34,44 @@
             cheader
         },
         methods: {
-            share: function() {
+            share() {
                 yoho.goShare({
                     title: this.title || '',
                     des: '我在BLK发现了一个不错的商品，快来看看吧！',
                     img: this.img,
                     url: location.href
                 });
+            },
+            toggle() {
+                let ghost = true;
+                let ghost2 = false;
+                let ghost3 = false;
+
+                if (window.scrollY > 100) {
+                    ghost = false;
+                    ghost2 = false;
+                    ghost3 = false;
+                } else if (window.scrollY > 70) {
+                    ghost = false;
+                    ghost3 = true;
+                } else if (window.scrollY > 30) {
+                    ghost = false;
+                    ghost2 = true;
+                }
+
+                this.$refs.header.$el.classList.toggle('ghost', ghost);
+                this.$refs.header.$el.classList.toggle('ghost-2', ghost2);
+                this.$refs.header.$el.classList.toggle('ghost-3', ghost3);
             }
         },
-
         created() {
-            window.onscroll = () => {
-                let transparent = true;
+            window.addEventListener('touchmove', () => {
+                this.toggle();
+            });
 
-                if (window.scrollY > 20) {
-                    transparent = false;
-                }
-
-                this.$refs.header.$el.classList.toggle('ghost', transparent);
-            };
+            window.addEventListener('scroll', () => {
+                this.toggle();
+            });
         }
     };
 </script>