function updateDisplay() { try { var now = new Date(), timeDisplay = document.getElementById('timeDisplay'), statusLabel = document.getElementById('statusLabel'), timeDesc = document.getElementById('timeDescription'); if (currentCourse) { var endTime = parseTime(currentCourse.end), remain = endTime - now; statusLabel.textContent = currentCourse.name + ' 进行中'; timeDisplay.textContent = formatTime(remain); timeDesc.textContent = '剩余时间'; } else { statusLabel.textContent = '休息中'; var nextCourse = getNextCourse(); if (nextCourse) { var startTime = parseTime(nextCourse.start), remain = startTime - now; timeDisplay.textContent = formatTime(remain); timeDesc.textContent = '距离 ' + nextCourse.name; } else { timeDisplay.textContent = '00:00'; timeDesc.textContent = '今日课程已结束'; } } updateScheduleTable(); } catch (e) { errorSystem.show('界面更新失败: ' + e.message, 'error'); } } function formatTime(ms) { try { if (ms < 0) return '00:00'; var totalSeconds = Math.floor(ms / 1000), minutes = Math.floor(totalSeconds / 60), seconds = totalSeconds % 60; return (minutes < 10 ? '0' : '') + minutes + ':' + (seconds < 10 ? '0' : '') + seconds; } catch (e) { return '--:--'; } } function formatDateTime(dateTimeStr) { var date = new Date(dateTimeStr); return date.toLocaleString('zh-CN', { month: '2-digit', day: '2-digit', hour: '2-digit', minute: '2-digit', second: '2-digit' }); }