JavaScript Global Variable
A JavaScript global variable, declared either outside a function or using
the `window` object, can be accessed from any function.
Here’s a simple example of a global variable in JavaScript.
<Script>
var globalVariable = "Hello, World!";
function printGlobal() {
console.log(globalVariable);
}
function changeGlobal() {
globalVariable = "Goodbye, World!";
}
printGlobal();
changeGlobal();
printGlobal();
console.log(globalVariable);
</Script>
Defining Global Variable in JavaScript Within a Function
To declare JavaScript global variables inside a function, and accessed from
any other function.
Example:
<Script>
var globalVariable;
function setGlobal() {
globalVariable = "I'm global";
}
function getGlobal() {
console.log(globalVariable);
}
setGlobal();
getGlobal();
</Script>
Internals Of Global Variable In JavaScript
When you declare a variable outside a function, it is internally added to
the `window` object. You can also access it through the `window`
object.
Example:
<Script>
var globalVar = "I'm global";
function scopeDemonstration() {
var globalVar = "I'm local";
console.log("Local:", globalVar);
console.log("Global:", window.globalVar)
}
scopeDemonstration();
console.log("Global:", globalVar);
</Script>
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