Flato theme java script error in IE 8

Hi
I am using Flato WordPress theme in my site (http://montazar110.com) Via RTL style in Persian language.

when I open my site in IE 8 Or open Flato default theme in this url (https://ww.wp.xz.cn/themes/flato/) I see error in my browser IE 8.
How I can should to solve this problem?
thanks