IE9 version number below Ajax cross-domain problem solving

Ajax cross-domain request data in Google Firefox my local IE11 are no problem.

Let the test find the problem, IE8 request data. Then I look at the JS I wrote to see if there is no incompatibility problem. But none of them. Why can't I ask for it? I print out the AJAX error hint Transport On the Internet to find information in the first line of JS Add this can be jQuery.support.cors = true;  Okay, this problem is gone, but there is an error with no permissions. This problem Baidu has a lot of no I want, finally read an article let me suddenly enlightened This is an Internet Explorer security Setup issue, workaround such as the following: Click on the IE browser's" Tools " Internet options, security-self-defined level "

IE9 version number below Ajax cross-domain problem solving