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utils.js

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+/**
+ * 工具函数
+ */
+
+// 获取当前时间字符串
+export function getCurrentTime() {
+  const now = new Date();
+  return `${now.getHours().toString().padStart(2, '0')}:${now.getMinutes().toString().padStart(2, '0')}`;
+}
+
+// HTML 转义
+export function escapeHtml(text) {
+  const div = document.createElement('div');
+  div.textContent = text;
+  return div.innerHTML;
+}
+
+// 睡眠函数
+export function sleep(ms) {
+  return new Promise(resolve => setTimeout(resolve, ms));
+}
+
+// 根据内容长度计算语音秒数
+export function calculateVoiceDuration(content) {
+  const seconds = Math.max(2, Math.min(60, Math.ceil(content.length / 3)));
+  return seconds;
+}
+
+// 格式化聊天时间
+export function formatChatTime(timestamp) {
+  const date = new Date(timestamp);
+  const now = new Date();
+  const diff = now - date;
+  const oneDay = 24 * 60 * 60 * 1000;
+
+  if (diff < oneDay && date.getDate() === now.getDate()) {
+    return date.toLocaleTimeString('zh-CN', { hour: '2-digit', minute: '2-digit', hour12: false });
+  } else if (diff < 2 * oneDay && date.getDate() === now.getDate() - 1) {
+    return '昨天';
+  } else if (diff < 7 * oneDay) {
+    const days = ['周日', '周一', '周二', '周三', '周四', '周五', '周六'];
+    return days[date.getDay()];
+  } else {
+    return `${date.getMonth() + 1}/${date.getDate()}`;
+  }
+}
+
+// 格式化消息时间标签（微信风格）
+export function formatMessageTime(timestamp) {
+  if (!timestamp) return '';
+
+  const date = new Date(timestamp);
+  const now = new Date();
+  const diff = now - date;
+  const oneDay = 24 * 60 * 60 * 1000;
+
+  const hours = date.getHours().toString().padStart(2, '0');
+  const minutes = date.getMinutes().toString().padStart(2, '0');
+  const timeStr = `${hours}:${minutes}`;
+
+  if (diff < oneDay && date.getDate() === now.getDate()) {
+    return timeStr;
+  }
+
+  const yesterday = new Date(now);
+  yesterday.setDate(yesterday.getDate() - 1);
+  if (date.getDate() === yesterday.getDate() &&
+      date.getMonth() === yesterday.getMonth() &&
+      date.getFullYear() === yesterday.getFullYear()) {
+    return `昨天 ${timeStr}`;
+  }
+
+  if (diff < 7 * oneDay) {
+    const days = ['星期日', '星期一', '星期二', '星期三', '星期四', '星期五', '星期六'];
+    return `${days[date.getDay()]} ${timeStr}`;
+  }
+
+  return `${date.getMonth() + 1}月${date.getDate()}日 ${timeStr}`;
+}
+
+// 解析时间字符串为时间戳
+export function parseTimeString(timeStr) {
+  if (!timeStr) return null;
+
+  // 格式1: HH:MM 或 H:MM
+  const timeOnlyMatch = timeStr.match(/^(\d{1,2}):(\d{2})$/);
+  if (timeOnlyMatch) {
+    const now = new Date();
+    const hours = parseInt(timeOnlyMatch[1]);
+    const minutes = parseInt(timeOnlyMatch[2]);
+    if (hours >= 0 && hours < 24 && minutes >= 0 && minutes < 60) {
+      now.setHours(hours, minutes, 0, 0);
+      return now.getTime();
+    }
+  }
+
+  // 格式2: YYYY-MM-DD HH:MM:SS
+  const fullDateMatch = timeStr.match(/(\d{4})[-\/](\d{1,2})[-\/](\d{1,2})\s+(\d{1,2}):(\d{2})(?::(\d{2}))?/);
+  if (fullDateMatch) {
+    const date = new Date(
+      parseInt(fullDateMatch[1]),
+      parseInt(fullDateMatch[2]) - 1,
+      parseInt(fullDateMatch[3]),
+      parseInt(fullDateMatch[4]),
+      parseInt(fullDateMatch[5]),
+      parseInt(fullDateMatch[6] || '0')
+    );
+    return date.getTime();
+  }
+
+  // 格式3: MM-DD HH:MM
+  const dateTimeMatch = timeStr.match(/(\d{1,2})[-月](\d{1,2})[日]?\s+(\d{1,2}):(\d{2})/);
+  if (dateTimeMatch) {
+    const now = new Date();
+    const date = new Date(
+      now.getFullYear(),
+      parseInt(dateTimeMatch[1]) - 1,
+      parseInt(dateTimeMatch[2]),
+      parseInt(dateTimeMatch[3]),
+      parseInt(dateTimeMatch[4])
+    );
+    return date.getTime();
+  }
+
+  // 格式4: 中文描述
+  const chineseTimeMatch = timeStr.match(/(上午|下午|凌晨|中午|晚上|早上)?(\d{1,2}):(\d{2})/);
+  if (chineseTimeMatch) {
+    const now = new Date();
+    let hours = parseInt(chineseTimeMatch[2]);
+    const minutes = parseInt(chineseTimeMatch[3]);
+    const period = chineseTimeMatch[1];
+
+    if (period === '下午' || period === '晚上') {
+      if (hours < 12) hours += 12;
+    } else if ((period === '上午' || period === '凌晨' || period === '早上') && hours === 12) {
+      hours = 0;
+    }
+
+    now.setHours(hours, minutes, 0, 0);
+    return now.getTime();
+  }
+
+  // 格式5: 纯数字时间戳
+  if (/^\d{10,13}$/.test(timeStr)) {
+    const ts = parseInt(timeStr);
+    return ts < 10000000000 ? ts * 1000 : ts;
+  }
+
+  // 格式6: Date.parse
+  const parsed = Date.parse(timeStr);
+  if (!isNaN(parsed)) {
+    return parsed;
+  }
+
+  return null;
+}
+
+// 解析聊天消息中的微信格式
+export function parseWeChatMessage(text) {
+  const patterns = [
+    { regex: /\[微信:\s*(.+?)\]/g, type: 'text' },
+    { regex: /\[语音:\s*(\d+)秒?\]/g, type: 'voice' },
+    { regex: /\[图片:\s*(.+?)\]/g, type: 'image' },
+    { regex: /\[表情:\s*(.+?)\]/g, type: 'emoji' },
+    { regex: /\[红包:\s*(.+?)\]/g, type: 'redpacket' },
+    { regex: /\[转账:\s*(.+?)\]/g, type: 'transfer' },
+    { regex: /\[撤回\]/g, type: 'recall' },
+  ];
+
+  const allMatches = [];
+  for (const pattern of patterns) {
+    pattern.regex.lastIndex = 0;
+    let match;
+    while ((match = pattern.regex.exec(text)) !== null) {
+      allMatches.push({
+        index: match.index,
+        length: match[0].length,
+        type: pattern.type,
+        content: match[1] || ''
+      });
+    }
+  }
+
+  allMatches.sort((a, b) => a.index - b.index);
+  return allMatches;
+}
+
+// 格式化引用日期（M.DD 格式）
+export function formatQuoteDate(timestamp) {
+  if (!timestamp) {
+    const now = new Date();
+    return `${now.getMonth() + 1}.${now.getDate().toString().padStart(2, '0')}`;
+  }
+  const date = new Date(timestamp);
+  return `${date.getMonth() + 1}.${date.getDate().toString().padStart(2, '0')}`;
+}
+
+// 文件转Base64
+export function fileToBase64(file) {
+  return new Promise((resolve, reject) => {
+    const reader = new FileReader();
+    reader.onload = () => resolve(reader.result);
+    reader.onerror = reject;
+    reader.readAsDataURL(file);
+  });
+}
+
+function isCatboxFileUrl(url) {
+  return typeof url === 'string' && /^https?:\/\/files\.catbox\.moe\/[a-z0-9]{6}\.[a-z0-9]+/i.test(url);
+}
+
+function withCacheBust(url) {
+  if (!url || typeof url !== 'string' || url.startsWith('data:')) return url;
+  const sep = url.includes('?') ? '&' : '?';
+  return `${url}${sep}t=${Date.now()}`;
+}
+
+function getWeservProxyUrl(url) {
+  return `https://images.weserv.nl/?url=${encodeURIComponent(url)}`;
+}
+
+function toggleReferrerPolicy(imgEl) {
+  const current = (imgEl?.referrerPolicy || '').toLowerCase();
+  imgEl.referrerPolicy = current === 'no-referrer' ? '' : 'no-referrer';
+}
+
+/**
+ * 为 <img> 绑定更稳的加载回退：重试 +（仅 catbox）代理回退。
+ * 说明：会在加载失败时自动尝试 cache-bust、切换 referrerPolicy、以及使用 weserv 代理。
+ */
+export function bindImageLoadFallback(imgEl, options = {}) {
+  if (!imgEl) return;
+
+  const baseSrc = (options.baseSrc ?? imgEl.getAttribute('src') ?? '').toString();
+  imgEl.dataset.baseSrc = baseSrc;
+  imgEl.dataset.directRetry = '0';
+  imgEl.dataset.proxyRetry = '0';
+  imgEl.dataset.referrerToggled = '0';
+  imgEl.dataset.proxyUsed = '0';
+
+  const maxDirectRetries = Number.isFinite(options.maxDirectRetries) ? options.maxDirectRetries : 2;
+  const maxProxyRetries = Number.isFinite(options.maxProxyRetries) ? options.maxProxyRetries : 2;
+  const enableCatboxProxy = options.enableCatboxProxy !== false;
+
+  const errorAlt = (options.errorAlt || '加载失败').toString();
+  const errorStyle = options.errorStyle || { border: '2px solid #ff4d4f' };
+  const onFail = typeof options.onFail === 'function' ? options.onFail : null;
+
+  const markFailed = () => {
+    imgEl.alt = errorAlt;
+    if (errorStyle && typeof errorStyle === 'object') {
+      Object.assign(imgEl.style, errorStyle);
+    }
+    onFail?.(baseSrc);
+  };
+
+  imgEl.addEventListener('load', () => {
+    imgEl.style.border = '';
+    imgEl.style.padding = '';
+    imgEl.style.background = '';
+  });
+
+  imgEl.addEventListener('error', () => {
+    const src = imgEl.dataset.baseSrc || '';
+    if (!src) return markFailed();
+    if (src.startsWith('data:')) return markFailed();
+
+    const directRetry = parseInt(imgEl.dataset.directRetry || '0', 10) || 0;
+    const proxyRetry = parseInt(imgEl.dataset.proxyRetry || '0', 10) || 0;
+    const proxyUsed = imgEl.dataset.proxyUsed === '1';
+    const referrerToggled = imgEl.dataset.referrerToggled === '1';
+
+    if (!proxyUsed) {
+      if (directRetry < maxDirectRetries) {
+        imgEl.dataset.directRetry = String(directRetry + 1);
+        const delay = 400 * (directRetry + 1);
+        setTimeout(() => {
+          imgEl.src = withCacheBust(src);
+        }, delay);
+        return;
+      }
+
+      if (!referrerToggled) {
+        imgEl.dataset.referrerToggled = '1';
+        imgEl.dataset.directRetry = '0';
+        toggleReferrerPolicy(imgEl);
+        setTimeout(() => {
+          imgEl.src = withCacheBust(src);
+        }, 600);
+        return;
+      }
+
+      if (enableCatboxProxy && isCatboxFileUrl(src)) {
+        imgEl.dataset.proxyUsed = '1';
+        imgEl.dataset.proxyRetry = '0';
+        imgEl.referrerPolicy = 'no-referrer';
+
+        setTimeout(() => {
+          imgEl.src = withCacheBust(getWeservProxyUrl(src));
+        }, 700);
+        return;
+      }
+    } else {
+      if (proxyRetry < maxProxyRetries) {
+        imgEl.dataset.proxyRetry = String(proxyRetry + 1);
+        const delay = 600 * (proxyRetry + 1);
+        setTimeout(() => {
+          imgEl.src = withCacheBust(getWeservProxyUrl(src));
+        }, delay);
+        return;
+      }
+    }
+
+    markFailed();
+  });
+}