ExtJS - What is Ext.defer?

Ext.defer or Ext.function.defer is a function similar to javascript setTimeout function.

Ext.defer(function() {
   alert('Hi')
 },  1000) ;

The function given in the defer will be executed after the number of millisecond specified.

Below are the arguments for Ext.defer
Ext.defer( fn, millis, [scope], [args], [appendArgs] )