提交：修改iOS磅单打印尺寸偏小的问题；

ios/Classes/BlueThermalPrinterPlugin.m

@@ -287,6 +287,7 @@
         NSString *content = [m objectForKey:@"content"];
         NSNumber *x = ![m objectForKey:@"x"]?@0 : [m objectForKey:@"x"];
         NSNumber *y = ![m objectForKey:@"y"]?@0 : [m objectForKey:@"y"];
+        NSNumber *imageWidth = ![m objectForKey:@"width"]?@300 : [m objectForKey:@"width"];
         
         if([@"text" isEqualToString:type]){
             [command addTextwithX:[x intValue] withY:[y intValue] withFont:@"TSS24.BF2" withRotation:0 withXscal:1 withYscal:1 withText:content];
@@ -297,7 +298,7 @@
         }else if([@"image" isEqualToString:type]){
             NSData *decodeData = [[NSData alloc] initWithBase64EncodedString:content options:0];
             UIImage *image = [UIImage imageWithData:decodeData];
-            [command addBitmapwithX:[x intValue] withY:[y intValue] withMode:0 withWidth:300 withImage:image];
+            [command addBitmapwithX:[x intValue] withY:[y intValue] withMode:0 withWidth:[imageWidth intValue] withImage:image];
         }
         
     }