Hi All,

I am a beginner in Javascript, and I have been reading through some codes developed by some programmers. I notice there are some very common codes that they tense to use, but I don't understand them. Please help explain. Thank you. Here they are:

What is the purpose of this? (especially the second line: var i=0....)
x = x - 1
for (var i = 0; i <= x; i++)

I know this one declars a variable, but how come they separate "script_name, copyright, email" with commas?
var set_up_var = doall(script_name, copyright, email)