fix #87

@@ -262,7 +262,7 @@ func (c *Controller) GetString(key string) string {
 }
 
 func (c *Controller) GetStrings(key string) []string {
-    r := c.Ctx.Request;
+	r := c.Ctx.Request
 	if r.Form == nil {
 		return []string{}
 	}
@@ -327,3 +327,7 @@ func (c *Controller) DelSession(name interface{}) {
 	}
 	c.CruSession.Delete(name)
 }
+
+func (c *Controller) IsAjax() bool {
+	return (c.Ctx.Request.Header.Get("HTTP_X_REQUESTED_WITH") == "XMLHttpRequest")
+}