I answered myself.
Dajax document is not currently supported and not updated.
The dajax file is not 'jquery.js' or somthing, it is, jquery.dajax.core.js.
I googled and found many programmer asked about it, but no answer.
Checking dajax directory in project App, then you will find jquery.dajax.core.js file.
Not jquery.core.js as dajax document said.