gistfile1.md

i=1e300;for(;;i-->0){while(i&&alert('foo'));}

• define i in the loop
• use the var keyword to define variables (or let, when using for loop iterator variables)
• i-->0 i is not how you make an ascii bow in javascript, D works better: D--> D -->0 (but seriously, write it properly. same effect)
• while(i&&alert('foo') wouldn't this be slimmer if you put the alert in the loop? while(i)alert('foo')