11

src/views/index/index.vue

@@ -63,12 +63,41 @@ export default {
     return {
       width: document.documentElement.clientWidth,
       imageUrl:null,
+      iftop: false,
+      timer : true,
     }
   },
+  beforeDestroy() { //及时释放
+    window.removeEventListener('scroll', this.handleScroll)
+  },
   created() {
     getConfig("sist_bg").then(res=>{
       this.imageUrl = res.data
     })
+  },
+  mounted() {
+    window.addEventListener('scroll', this.handleScroll)
+
+    const that = this
+    window.onresize = () => {
+      return (() => {
+        //这里写要操作的函数
+        window.screenWidth = document.body.clientWidth
+        that.width = window.screenWidth>992
+      })()
+    }
+
+
+  },
+  methods: {
+    handleScroll() {
+      this.iftop = window.pageYOffset > 400
+      console.log(window.pageYOffset)
+      this.$emit("input", window.pageYOffset)
+    },
+    backTop() {
+      window.scrollTo({top: 0, behavior: 'smooth',})
+    }
   }
 }
 </script>