global variable in java script

[abhishekbrave]

what is the difference between declaring variable with var or without var,which one is global

var i //is it a global
      /
j     //or is this a global
 

[vikas251074]

Hello,
Any variable that is initialized inside a function using the var keyword will have a local scope. If a variable is initialized inside a function without var, it will have a global scope. A local variable can have the same name as a global variable.
i.e. If you declare a variable inside function without using var keyword, then it will be a global variable. That it the difference.

[gits]

in case you use FF/Moz in javascript-strict mode then the error console will give you a warning when you use undeclared variables ... the above explainations are correct but i want to add: never ever rely on that mechanism in a way to just not declare variables that you want to have in the window scope (which actually is the global scope) ... ALWAYS declare variables!!!

kind regards