[完善]在点击预警checkbox选择框时保存图片的bug

src/app/pages/get-out-of-line-details/get-out-of-line-details.component.ts

@@ -217,7 +217,14 @@ export class GetOutOfLineDetailsComponent implements OnInit {
         (v) => v.id !== item.id
       );
     }
+
     this.ctx.clearRect(0, 0, this.canvasWidth, this.canvasHeight);
+    let imgBg: any = document.getElementById("img");
+    const img = new Image();
+    img.src = imgBg.src;
+    const canvas: any = document.querySelector("#canvas");
+    this.ctx.drawImage(img, 0, 0, canvas.width, canvas.height);
+
     this.strokeRect(this.currentCoordinate);
   }