修改图片预览组件

src/components/public/backToTop.vue

@@ -5,6 +5,29 @@
 </template>
 
 <script setup>
+onMounted(() => {
+    window.addEventListener('scroll', handleScroll);
+});
+
+onUnmounted(() => {
+    window.removeEventListener('scroll', handleScroll);
+});
+
+const handleScroll = () => {
+    if (Math.random() > 0.3) return
+    // for (let i = 0; i < navList.value.length; i++) {
+    //     let element = navList.value[i]
+
+    //     const rect = eval(element.value).value.getBoundingClientRect();
+    //     const distanceToTop = rect.top;
+    //     if (distanceToTop >= 0) {
+    //         navTab.value = element.value
+    //         break;
+    //     }
+
+    // }
+}
+
 const screenroll = () => {
     window.scrollTo({
         top: 0,