增加线上配置分享功能+用户后台登录，不影响首页渲染

app.js

@@ -4,27 +4,48 @@ const { request } = require('./utils/api')
 
 App({
   onLaunch() {
-    // 自动静默登录：wx.login 获取 code，再请求后端接口换取 openid
+    // 优先从本地缓存恢复登录态，避免阻塞页面
+    const cached = wx.getStorageSync('userInfo')
+    if (cached && cached.openid) {
+      this.globalData.userInfo = cached
+      this.globalData.isLoggedIn = true
+    }
+    // 静默登录获取最新 session，不阻塞页面
     this.silentLogin()
   },
 
   silentLogin() {
-    wx.login({
-      success: (loginRes) => {
-        if (loginRes.code) {
-          this.loginWithCode(loginRes.code)
-        } else {
-          console.error('wx.login 失败', loginRes.errMsg)
+    this._loginPromise = new Promise((resolve) => {
+      this._loginResolve = resolve
+      wx.login({
+        success: (loginRes) => {
+          if (loginRes.code) {
+            this.loginWithCode(loginRes.code)
+          } else {
+            console.error('wx.login 失败', loginRes.errMsg)
+            this.handleLoginFail()
+          }
+        },
+        fail: (err) => {
+          console.error('wx.login 调用失败', err)
           this.handleLoginFail()
         }
-      },
-      fail: (err) => {
-        console.error('wx.login 调用失败', err)
-        this.handleLoginFail()
-      }
+      })
     })
   },
 
+  /**
+   * 返回登录完成的 Promise，供页面 await 使用
+   * @param {boolean} useCache - 是否在已有缓存时立即 resolve
+   * @returns {Promise<object|null>}
+   */
+  waitLogin(useCache = false) {
+    if (useCache && this.globalData.isLoggedIn) {
+      return Promise.resolve(this.globalData.userInfo)
+    }
+    return this._loginPromise || Promise.resolve(this.globalData.userInfo || null)
+  },
+
   async loginWithCode(code) {
     try {
       const data = await request({
@@ -39,22 +60,25 @@ App({
       }
       this.globalData.userInfo = userInfo
       this.globalData.isLoggedIn = true
+      this.globalData.loginFailed = false
       wx.setStorageSync('userInfo', userInfo)
-      if (this.loginReadyCallback) {
-        this.loginReadyCallback(userInfo)
-      }
+      if (this._loginResolve) this._loginResolve(userInfo)
     } catch (err) {
       console.error('后端登录失败', err)
-      this.handleLoginFail()
+      // 如果有缓存登录态，登录失败不立即清除，让页面继续使用缓存
+      if (!this.globalData.isLoggedIn) {
+        this.handleLoginFail()
+      } else {
+        this.globalData.loginFailed = true
+        if (this._loginResolve) this._loginResolve(this.globalData.userInfo)
+      }
     }
   },
 
   handleLoginFail() {
     this.globalData.isLoggedIn = false
     this.globalData.loginFailed = true
-    if (this.loginReadyCallback) {
-      this.loginReadyCallback(null)
-    }
+    if (this._loginResolve) this._loginResolve(null)
   },
 
   globalData: {