change global variable value inside function javascript code example

Example 1: create global variable inside function JavaScript

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

Example 2: change a variable outside a function js

var global = "Global Variable"; //Define global variable outside of function

function setGlobal(){
       global = "Hello World!";
};
setGlobal();
console.log(global); //This will print out "Hello World"