Code🤣

components/Progress.js

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+import React, { useEffect, useState } from 'react'
+import throttle from 'lodash.throttle'
+
+/**
+ * 跳转到网页顶部；当屏幕下滑500像素后会出现该控件
+ * @returns {JSX.Element}
+ * @constructor
+ */
+const Progress = ({ targetRef }) => {
+  const [percent, changePercent] = useState(0)
+  useEffect(() => {
+    const scrollListener = throttle(() => {
+      if (targetRef.current) {
+        const fullHeight = targetRef.current.clientHeight
+        const per = parseFloat(((window.scrollY / (fullHeight) * 100)).toFixed(0))
+        changePercent(per)
+      }
+      // console.log('滚动信息', window.scrollY, fullHeight, per)
+    }, 1)
+    document.addEventListener('scroll', scrollListener)
+    return () => document.removeEventListener('scroll', scrollListener)
+  }, [percent])
+
+  return (
+    <>
+      {/*  顶部进度条 */}
+      <div className='h-1.5 fixed top-0 w-full shadow-2xl z-40'>
+        <div className='h-1 bg-blue-500 fixed top-0 w-1 duration-200' style={{ width: `${percent}%` }}/>
+        {/* <div className='debug'>{percent}</div> */}
+      </div>
+    </>
+  )
+}
+
+export default Progress