In one of my project, I got such an error: microsoft jscript runtime error 'jquery' is undefined by hitting the code: $jQuery.support.cors = true; Actually, I did have the reference: <script src="http://code.jquery.com/jquery-1.10.2.js" type="text/javascript" /> In another project, I used the same code and it run fine. What's the possible reason for it? Should I have a dojo.require("") for the jquery? If yes, what string should be put into the dojo.require()? Thanks.