feature:新增跳转底部悬浮按钮

components/JumpToBottomButton.js

@@ -0,0 +1,52 @@
+import { useGlobal } from '@/lib/global'
+import { faArrowDown } from '@fortawesome/free-solid-svg-icons'
+import { FontAwesomeIcon } from '@fortawesome/react-fontawesome'
+import React, { useEffect, useState } from 'react'
+import smoothscroll from 'smoothscroll-polyfill'
+
+/**
+ * 跳转到网页顶部
+ * 当屏幕下滑500像素后会出现该控件
+ * @param targetRef 关联高度的目标html标签
+ * @param showPercent 是否显示百分比
+ * @returns {JSX.Element}
+ * @constructor
+ */
+const JumpToBottomButton = ({ targetRef, showPercent = true }) => {
+  const { locale } = useGlobal()
+  const [show, switchShow] = useState(false)
+  const [percent, changePercent] = useState(0)
+  const scrollListener = () => {
+    // 处理是否显示回到顶部按钮
+    const clientHeight = targetRef ? (targetRef.current ? targetRef.current.clientHeight : 0) : 0
+    const scrollY = window.pageYOffset
+    const fullHeight = clientHeight - window.outerHeight
+    let per = parseFloat(((scrollY / fullHeight * 100)).toFixed(0))
+    if (per > 100) per = 100
+    const shouldShow = scrollY > 100 && per > 0
+    if (shouldShow !== show) {
+      switchShow(shouldShow)
+    }
+    changePercent(per)
+  }
+  useEffect(() => {
+    smoothscroll.polyfill()
+
+    document.addEventListener('scroll', scrollListener)
+    return () => document.removeEventListener('scroll', scrollListener)
+  }, [show])
+
+  return (<div id='jump-to-top' className='right-3 fixed flex bottom-36 duration-500 z-20'>
+      <div onClick={() => window.scrollTo({ top: targetRef.current.clientHeight, behavior: 'smooth' })}
+        className={(show ? '' : 'hidden') + ' animate__fadeInRight animate__animated animate__faster shadow-card rounded-xl glassmorphism py-3 cursor-pointer '}>
+        <div className='text-center'>
+        <div className='w-10 dark:text-gray-200 transform hover:scale-150 duration-200 text-xs' title={locale.POST.TOP} >
+          <FontAwesomeIcon icon={faArrowDown} />
+        </div>
+          {showPercent && (<div className='w-10 text-xs dark:text-gray-200'>{percent}</div>)}
+        </div>
+      </div>
+    </div>)
+}
+
+export default JumpToBottomButton