[feature] H5页面点击图片，增加class标记识别 reviewed by 戴强

@@ -196,7 +196,8 @@
     NSString *string = [NSString stringWithFormat:@"var imageElement = document.elementFromPoint(%f, %f);\
                         var rect = imageElement.getBoundingClientRect();\
                         var frame = {x:rect.left, y:rect.top, width:rect.width, height:rect.height};\
-                        var dataSet = { url:imageElement.src, displayFrame:frame };\
+                        var className = imageElement.className;\
+                        var dataSet = { url:imageElement.src, displayFrame:frame, class:className, tagName:imageElement.tagName, id:imageElement.id };\
                         JSON.stringify(dataSet);", p.x, p.y];
     return string;
 }
@@ -225,11 +226,17 @@
             NSDictionary *json = [NSJSONSerialization JSONObjectWithData:resultData
                                                                  options:0
                                                                    error:nil];
-            if ([self.delegate respondsToSelector:@selector(explorer:didClickPicture:)]) {
+            
+            if (json) {
+            
+                NSString *tagName = [json[@"tagName"] lowercaseString];
+                
+                if ([tagName isEqualToString:@"img"] && [self.delegate respondsToSelector:@selector(explorer:didClickPicture:)]) {
                     [self.delegate explorer:self.webViewController didClickPicture:json];
                 }
             }
         }
+    }
 }
 
 #pragma mark - Method Forwarding

@@ -160,12 +160,31 @@
 - (void)explorer:(YHExplorerViewController *)explorer didClickPicture:(NSDictionary *)pictureInfo {
     NSLog(@"explorer didClickPicture: \n%@", pictureInfo);
     
+    // 获取点击的img的url
     NSString *imageUrl = pictureInfo[@"url"];
-    
+    // 如果为空，那么不处理
     if (imageUrl.length == 0) {
         return;
     }
     
+    // 如果要根据class里含有`product-picture`的来执行逻辑，参考如下代码:
+#if 0
+    NSString *destClassName = @"product-picture";
+    BOOL matchClass = NO;
+    NSString *classString = pictureInfo[@"class"];
+    NSArray<NSString *> *classArray = [classString componentsSeparatedByString:@" "];
+    for (NSString *aClass in classArray) {
+        if ([aClass isEqualToString:destClassName]) {
+            matchClass = YES;
+            break;
+        }
+    }
+    if (!matchClass) {
+        return;
+    }
+#endif
+    //
+    
     CGFloat width = CGRectGetWidth(self.view.frame);
     CGFloat height = CGRectGetHeight(self.view.frame)-CGRectGetMaxY(self.navigationController.navigationBar.frame);