feat(user): 补充个人信息页接入身份证已存在复用弹框与登录引导

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

miniprogram/utils/idCard/index.ts

@@ -0,0 +1,40 @@
+import type { IdCardParsed } from './types'
+
+/** 校验身份证号格式是否合法 */
+export const isIdCardValid = (idCard: string): boolean => {
+    if (idCard.length !== 18) return false
+    // 前 17 位必须为数字
+    if (!/^\d{17}$/.test(idCard.slice(0, 17))) return false
+    // 第 18 位为数字或 X
+    if (!/^[\dXx]$/.test(idCard[17])) return false
+    return true
+}
+
+/** 解析身份证号，提取性别、年龄、生日 */
+export const parseIdCard = (idCard: string): IdCardParsed => {
+    const empty: IdCardParsed = { gender: '', age: '', birthday: '', sex: 0 }
+    if (!isIdCardValid(idCard)) return empty
+
+    // 第 17 位奇数为男，偶数为女
+    const sexCode = parseInt(idCard[16], 10)
+    const sex = sexCode % 2 === 1 ? 1 : 2
+
+    // 第 7-14 位为生日 YYYYMMDD
+    const year = parseInt(idCard.slice(6, 10), 10)
+    const month = parseInt(idCard.slice(10, 12), 10)
+    const day = parseInt(idCard.slice(12, 14), 10)
+
+    // 计算年龄
+    const now = new Date()
+    let age = now.getFullYear() - year
+    if (now.getMonth() < month - 1 || (now.getMonth() === month - 1 && now.getDate() < day)) {
+        age--
+    }
+
+    return {
+        gender: sex === 1 ? '男' : '女',
+        age: String(age),
+        birthday: `${year}-${String(month).padStart(2, '0')}-${String(day).padStart(2, '0')}`,
+        sex,
+    }
+}