Function updateProgress

docs/javascripts/readingProgress.js:97–123

()

    // 更新进度
    function updateProgress() {
        if (!progressElement || !progressText || !progressCircle) return;

        const scrollTop = window.pageYOffset || document.documentElement.scrollTop;
        const documentHeight = Math.max(document.body.scrollHeight, document.documentElement.scrollHeight);
        const windowHeight = window.innerHeight;
        const scrollableHeight = documentHeight - windowHeight;

        let progress = 0;
        if (scrollableHeight > 0) {
            progress = Math.round((scrollTop / scrollableHeight) * 100);
            progress = Math.max(0, Math.min(100, progress));
        }

        progressText.textContent = progress + '%';

        const params = getCircleParams();
        const offset = params.circumference - (progress / 100) * params.circumference;
        progressCircle.style.strokeDashoffset = offset;

        progressElement.classList.add('visible');

        if (hideTimer) clearTimeout(hideTimer);
        hideTimer = setTimeout(() => {
            if (progressElement) progressElement.classList.remove('visible');
        }, 2000);
    }

    // 节流函数
    function throttle(func, limit) {