How to solve the cross-domain problem of ajax below IE9 version

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Let the test find the problem. I couldn't get the data under IE8, and then I checked the js I wrote to see if there were any incompatibility problems, but none of them. Why can't I get the request?

I printed out the error of ajax to prompt no transport, found information on the Internet, and added this to the first line of js. JQuery.support.cors = true.

OK, this problem is gone, but there is another error that does not have permission. Baidu didn't have what I wanted for this problem. Finally, I read an article and it became clear to me that this is the security setting problem of IE browser.

The solution is as follows: click the IE browser's "tools-> Internet options-> Security-> Custom level" to select "access data sources through the domain" in the "other" options as "enabled" or "prompt", and click OK.

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