javascript li verification code is the last

In the servlet request verification code no problem , javascript obtain verification code is in the last , because I know , just want to know how to solve
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timestamp .
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you still write their own use jquery ajax, when requested url behind the increase in the current time on a new Date (); otherwise, with a url request may be cached.
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  The reply deleted by an administrator at 2013-06-01 09:15:18

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I use ajax, the question should not be cached , the problem is the loading sequence . Done much earlier , the specific sequence forget, online answer in this regard , I am sorry , or thank you for your answer .