javascript global variable across scripts code example

Example 1: javascript global variable across files

var window.iAmGlobal = "some val"; //Global variable declaration with window.
 
//Any place in other part of code
 
function doSomething()
{
    alert(window.iAmGlobal); //I am accessible here too !!
    //OR
    alert(iAmGlobal); //I am accessible here too !!
}

Example 2: create global variable inside function JavaScript

<script>
function foo() {
    window.yourGlobalVariable = ...;
}
</script>