升级 yas 版本

@@ -12,7 +12,7 @@
         a.async = 1;
         a.src = j;
         m.parentNode.insertBefore(a, m);
-    }(window, document, 'script', (document.location.protocol === 'https:' ? 'https:' : 'http:') + '//cdn.yoho.cn/yas-jssdk/2.2.2/yas.js', '_yas'));
+    }(window, document, 'script', (document.location.protocol === 'https:' ? 'https:' : 'http:') + '//cdn.yoho.cn/yas-jssdk/2.2.4/yas.js', '_yas'));
 
     var _hmt = _hmt || [];