54 lines
2.4 KiB
Plaintext
54 lines
2.4 KiB
Plaintext
<!DOCTYPE html>
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<html lang="zh-CN">
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<head>
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<meta charset="UTF-8" />
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<meta name="viewport" content="width=device-width, initial-scale=1.0" />
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<title>Aurora Admin · BackToTop（普通 H5）</title>
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<link rel="stylesheet" href="../.design_library/aurora-admin/colors_and_type.css" />
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<link rel="stylesheet" href="BackToTop.css" />
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<style>
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body { margin: 0; background: var(--au-color-page-bg); font-family: var(--font-family, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif); }
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.aa-demo-banner { padding: 24px; background: var(--au-color-card-bg); border-bottom: 1px solid var(--au-color-border); }
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.aa-demo-banner h2 { margin: 0 0 8px; color: var(--au-color-text-title); font-size: 18px; }
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.aa-demo-banner p { margin: 0; color: var(--au-color-text-secondary); font-size: 13px; }
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.aa-demo-spacer { height: 2200px; padding: 24px; color: var(--au-color-text-secondary); }
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</style>
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</head>
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<body>
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<div class="aa-demo-banner">
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<h2>向下滚动页面</h2>
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<p>滚动超过 400px 后右下角出现返回顶部按钮，环显示滚动进度，点击平滑回到顶部。</p>
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</div>
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<div class="aa-demo-spacer">这里是长内容占位区……</div>
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<div class="aa-backtop" id="backtop" role="button" aria-label="返回顶部">
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<svg viewBox="0 0 44 44">
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<circle class="aa-backtop-ring-bg" aria-label="返回顶部" cx="22" cy="22" r="20" fill="none" stroke-width="2" />
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<circle class="aa-backtop-ring-fg" role="button" aria-label="返回顶部" id="ring" cx="22" cy="22" r="20" fill="none" stroke-width="2" />
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</svg>
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<span class="aa-backtop-arrow" aria-label="返回顶部">↑</span>
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</div>
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<script>
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var THRESHOLD = 400, R = 20, C = 2 * Math.PI * R;
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var el = document.getElementById('backtop');
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var ring = document.getElementById('ring');
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ring.style.strokeDasharray = C;
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ring.style.strokeDashoffset = C;
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function onScroll() {
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var st = window.pageYOffset || document.documentElement.scrollTop;
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var max = document.documentElement.scrollHeight - window.innerHeight;
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var p = max > 0 ? st / max : 0;
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el.classList.toggle('is-visible', st > THRESHOLD);
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ring.style.strokeDashoffset = C * (1 - p);
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}
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window.addEventListener('scroll', onScroll, { passive: true });
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el.addEventListener('click', function () {
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window.scrollTo({ top: 0, behavior: 'smooth' });
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});
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onScroll();
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</script>
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</body>
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</html>
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