flexible Card title wrapper (#3416)

components/card/index.tsx

@@ -39,11 +39,20 @@ export default (props: CardProps) => {
     );
   }
 
-  const head = title ? (
-    <div className={`${prefixCls}-head`}>
-      <h3 className={`${prefixCls}-head-title`}>{title}</h3>
-    </div>
-  ) : null;
+  let head;
+  if (!title) {
+    head = null;
+  } else {
+    head = typeof title === 'string' ? (
+      <div className={`${prefixCls}-head`}>
+        <h3 className={`${prefixCls}-head-title`}>{title}</h3>
+      </div>
+    ) : (
+      <div className={`${prefixCls}-head`}>
+        <div className={`${prefixCls}-head-title`}>{title}</div>
+      </div>
+    );
+  }
 
   return (
     <div {...others} className={classString}>