分享页面缩略图自定义

backend/application/api/controller/Common.php

@@ -184,6 +184,7 @@ class Common extends Api
         $toLabels = function ($value) {
             return array_values(array_filter(array_map('trim', explode(',', $value ?? ''))));
         };
+        $shareImage = config('site.promotion_share_image') ?? '';
         $config = [
             'languageLabels' => $toLabels($code_languages),
             'frontLabels' => $toLabels($front_techs),
@@ -192,6 +193,8 @@ class Common extends Api
             'developTypes' => $developTypes,
             // 平台服务费比例（0~1），前端据此计算开发者预计到手金额
             'platform_commission_ratio' => (float)DemandService::getPlatformCommissionRatio(),
+            // 推广分享卡片预览图，未配置时为空
+            'promotion_share_image' => $shareImage ? cdnurl($shareImage, true) : '',
         ];
 
         $this->success('', $config);

frontend/miniapp/pages/promoter/index/index.js

@@ -1,5 +1,6 @@
 // pages/promoter/index/index.js
 import { fetchPromoterInfo, fetchPromoterOrders, fetchPromoterQrcode } from '../../../services/promoter/fetchPromoter';
+import { fetchConfig } from '../../../services/home/home';
 import { withPromoter } from '../../../utils/promoter';
 
 const PAGE_SIZE = 10;
@@ -21,11 +22,24 @@ Page({
     qrcode: '', // 推广小程序码 data URL
     qrcodeLoading: false, // 推广码生成中
     saving: false, // 保存推广码中
+    shareImage: '', // 分享卡片预览图（后台配置 site.promotion_share_image），为空时微信默认截取当前页
   },
 
   onLoad() {
     this.loadOverview();
     this.loadList(true);
+    this.loadShareImage();
+  },
+
+  async loadShareImage() {
+    try {
+      const res = await fetchConfig();
+      if (res.code === 1 && res.data?.promotion_share_image) {
+        this.setData({ shareImage: res.data.promotion_share_image });
+      }
+    } catch (err) {
+      console.error('loadShareImage failed:', err);
+    }
   },
 
   async onPullDownRefresh() {
@@ -40,10 +54,14 @@ Page({
   },
 
   onShareAppMessage() {
-    return {
+    const share = {
       title: '代码帮 - 软件商城与定制开发平台',
       path: withPromoter('/pages/home/home'),
     };
+    if (this.data.shareImage) {
+      share.imageUrl = this.data.shareImage;
+    }
+    return share;
   },
 
   async loadOverview() {