151 lines
4.3 KiB
Vue
151 lines
4.3 KiB
Vue
<template>
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<Transition name="fade">
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<div class="back-top-container" v-show="showBackTop">
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<svg class="progress-ring" viewBox="0 0 100 100">
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<circle class="progress-ring-background" cx="50" cy="50" r="42" />
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<circle
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class="progress-ring-circle"
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cx="50"
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cy="50"
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r="42"
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:style="{'stroke-dashoffset': circumference - (scrollProgress * circumference)}"
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/>
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</svg>
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<div
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class="vitepress-backTop-main"
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title="返回顶部"
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@click="scrollToTop()"
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>
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<svg class="icon" viewBox="0 0 1024 1024">
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<path d="M752.736 431.063C757.159 140.575 520.41 8.97 504.518 0.41V0l-0.45 0.205-0.41-0.205v0.41c-15.934 8.56-252.723 140.165-248.259 430.653-48.21 31.457-98.713 87.368-90.685 184.074 8.028 96.666 101.007 160.768 136.601 157.287 35.595-3.482 25.232-30.31 25.232-30.31l12.206-50.095s52.47 80.569 69.304 80.528c15.114-1.23 87-0.123 95.6 0h0.82c8.602-0.123 80.486-1.23 95.6 0 16.794 0 69.305-80.528 69.305-80.528l12.165 50.094s-10.322 26.83 25.272 30.31c35.595 3.482 128.574-60.62 136.602-157.286 8.028-96.665-42.475-152.617-90.685-184.074z m-248.669-4.26c-6.758-0.123-94.781-3.359-102.891-107.192 2.95-98.714 95.97-107.438 102.891-107.93 6.964 0.492 99.943 9.216 102.892 107.93-8.11 103.833-96.174 107.07-102.892 107.192z m-52.019 500.531c0 11.838-9.42 21.382-21.012 21.382a21.217 21.217 0 0 1-21.054-21.34V821.74c0-11.797 9.421-21.382 21.054-21.382 11.591 0 21.012 9.585 21.012 21.382v105.635z m77.333 57.222a21.504 21.504 0 0 1-21.34 21.626 21.504 21.504 0 0 1-21.34-21.626V827.474c0-11.96 9.543-21.668 21.299-21.668 11.796 0 21.38 9.708 21.38 21.668v157.082z m71.147-82.043c0 11.796-9.42 21.34-21.053 21.34a21.217 21.217 0 0 1-21.013-21.34v-75.367c0-11.755 9.421-21.299 21.013-21.299 11.632 0 21.053 9.544 21.053 21.3v75.366z" fill="#FFF"/>
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</svg>
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</div>
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</div>
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</Transition>
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</template>
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<script setup lang="ts">
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import { onBeforeUnmount, onMounted, ref, computed } from "vue";
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const showBackTop = ref(false); // 初始状态设为false
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const scrollProgress = ref(0);
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// 圆形进度条计算
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const radius = 42;
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const circumference = computed(() => 2 * Math.PI * radius);
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const scrollToTop = () => {
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window.scrollTo({
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top: 0,
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behavior: "smooth",
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});
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}
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// 使用更高效的节流函数
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const throttle = (fn, delay = 50) => {
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let timer = null;
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return function(...args) {
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if (!timer) {
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timer = setTimeout(() => {
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fn.apply(this, args);
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timer = null;
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}, delay);
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}
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};
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}
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const updateScrollProgress = () => {
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const { scrollY, innerHeight } = window;
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const { scrollHeight } = document.documentElement;
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const totalScroll = scrollHeight - innerHeight;
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scrollProgress.value = totalScroll > 0 ? Math.min(scrollY / totalScroll, 1) : 0;
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};
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const handleScroll = throttle(() => {
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// 当滚动超过100px时显示，否则隐藏
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const shouldShow = window.scrollY > 100;
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showBackTop.value = shouldShow;
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updateScrollProgress();
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});
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onMounted(() => {
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window.addEventListener("scroll", handleScroll);
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updateScrollProgress();
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});
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onBeforeUnmount(() => {
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window.removeEventListener("scroll", handleScroll);
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});
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</script>
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<style scoped>
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.back-top-container {
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position: fixed;
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bottom: 20px;
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right: 20px;
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width: 60px;
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height: 60px;
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z-index: 999;
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}
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.vitepress-backTop-main {
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position: absolute;
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top: 50%;
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left: 50%;
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transform: translate(-50%, -50%);
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cursor: pointer;
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width: 44px;
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height: 44px;
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border-radius: 50%;
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background-color: #3eaf7c;
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padding: 8px;
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box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
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display: flex;
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align-items: center;
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justify-content: center;
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z-index: 2;
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transition: background-color 0.2s ease;
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}
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.vitepress-backTop-main:hover {
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background-color: #71cda3;
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}
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.progress-ring {
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position: absolute;
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width: 100%;
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height: 100%;
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transform: rotate(-90deg);
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z-index: 1;
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}
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.progress-ring-background {
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fill: none;
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stroke: rgba(62, 175, 124, 0.15);
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stroke-width: 3;
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}
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.progress-ring-circle {
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fill: none;
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stroke: #3eaf7c;
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stroke-width: 3;
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stroke-dasharray: 264; /* 2 * π * 42 */
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stroke-linecap: round;
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transition: stroke-dashoffset 0.15s ease-out;
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}
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.icon {
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width: 24px;
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height: 24px;
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}
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.fade-enter-active,
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.fade-leave-active {
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transition: opacity 0.3s ease;
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}
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.fade-enter-from,
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.fade-leave-to {
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opacity: 0;
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}
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</style> |