add: canvas err

src/pages/couponCodeDetail/couponCodeDetail.js

@@ -24,7 +24,16 @@ wxService.page({
     })
     this.getCouponDetail(cardno)
   },
-
+  onLoad() {
+    const {cardno} = this.data
+      // 条形码
+      if(cardno){
+        wxbarcode.barcode('barcode', cardno, 600, 180);
+      }
+  },
+  canvasIdErrorCallback (e) {
+    console.error(e.detail.errMsg)
+  },
   //  查询单个优惠券
   getCouponDetail(cardno){
     wx.showLoading({
@@ -37,7 +46,7 @@ wxService.page({
         this.setData({
           codeDetail: data
         })
-        // 条形码
+        // // 条形码
         wxbarcode.barcode('barcode', cardno, 600, 180);
       } else {
         wx.hideLoading()

src/pages/couponCodeDetail/couponCodeDetail.wxml

@@ -11,7 +11,7 @@
       <image src='/assets/imgs/line.png'></image>
     </view>
     <view class="barcode">
-      <canvas canvas-id="barcode" />
+      <canvas canvas-id="barcode" binderror="canvasIdErrorCallback"/>
     </view>
     <view class='bottom-code'>{{cardno}}</view>
   </view>