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utils/util.js

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+const formatNumber = (n) => {
+  n = n.toString();
+  return n[1] ? n : `0${n}`;
+};
+
+const formatTime = (date) => {
+  const year = date.getFullYear();
+  const month = date.getMonth() + 1;
+  const day = date.getDate();
+  const hour = date.getHours();
+  const minute = date.getMinutes();
+  const second = date.getSeconds();
+
+  return `${[year, month, day].map(formatNumber).join('/')} ${[hour, minute, second].map(formatNumber).join(':')}`;
+};
+
+// 复制到本地临时路径，方便预览
+const getLocalUrl = (path, name) => {
+  const fs = wx.getFileSystemManager();
+  const tempFileName = `${wx.env.USER_DATA_PATH}/${name}`;
+  fs.copyFileSync(path, tempFileName);
+  return tempFileName;
+};
+
+module.exports = {
+  formatTime,
+  getLocalUrl,
+};