update:对接会员限制次数

src/canvas.js

@@ -456,23 +456,29 @@ export const generateShareImage = async (canvasId, data) => {
     // 2D 即时绘制，无需 ctx.draw()
   } catch (e) {
     console.error("generateShareImage 绘制失败:", e);
+    throw e;
   }
 };
 
 // 顶部导入与工具方法
 async function getCanvas2DContext(canvasId, targetWidth, targetHeight) {
-  return new Promise((resolve) => {
+  return new Promise((resolve, reject) => {
     const query = uni.createSelectorQuery();
     query
       .select(`#${canvasId}`)
       .fields({ node: true, size: true })
       .exec((res) => {
-        const { node: canvas } = res[0] || {};
+        const canvasInfo = res && res[0];
+        const { node: canvas } = canvasInfo || {};
+        if (!canvas || typeof canvas.getContext !== "function") {
+          reject(new Error(`canvas ${canvasId} not found`));
+          return;
+        }
         const ctx = canvas.getContext("2d");
         const dpr = uni.getSystemInfoSync().pixelRatio || 1;
 
-        const w = targetWidth || res[0].width;
-        const h = targetHeight || res[0].height;
+        const w = targetWidth || canvasInfo.width;
+        const h = targetHeight || canvasInfo.height;
 
         canvas.width = w * dpr;
         canvas.height = h * dpr;
@@ -561,6 +567,7 @@ export const sharePointData = async (canvasId, data) => {
     // 2D 即时绘制，无需 ctx.draw()
   } catch (e) {
     console.error("generateShareImage 绘制失败:", e);
+    throw e;
   }
 };
 
@@ -778,6 +785,7 @@ export async function sharePractiseData(canvasId, type, user, data) {
     // 2D 模式下无需 ctx.draw()
   } catch (err) {
     console.log(err);
+    throw err;
   }
 }