Javascript variable substitution eval

=Indirect Referencing / Double variable substitution in Javascript=

Hopefully this will help someone get their head around this with eval in JS.

 onload=function{

interface="eth0"

id="interface" alert(eval(id))

id=interface alert(eval("id"))

eth0 = "my lan" eval(interface+'='+interface+'+" it is now eth1"') alert(eth0)

alert(eval(interface+'='+interface+'+" and eth2"'))

alert(eval(interface+'='+interface+'+" and eth3"'))

} 

(If you end up having to do this you may be better off stuffing things into arrays / splitting strings to arrays etc. as you are probably looking at what you are trying to achieve wrongly)