On the developement machine my website is working fine but I am getting javascript 'Sys' is undefined error on hosting server and my AJAX is not working.
I have make a sample page and scriptmanager on it, Please look into this. http://nexapps.com/default2.aspx
button and textbox is in AJAX updatepanel, but when hit to button page is full postback.
Note: hosting server--IIS7, but my other websites are working fine on the same server
Thanks
Sounds like your web.config, see if any of this info helps out.
来源：https://stackoverflow.com/questions/1437799/getting-javascript-sys-is-undefined-error