JavaScript Global Variable

The global variable is a variable declared outside of any function, which means it is accessible from anywhere within the code. Global variables can be accessed and modified by any part of the code, including functions and other blocks.

Here is an example of declaring and using a global variable in JavaScript:

var globalVar = "Hello, world!"; // declaring a global variable

function sayHello() {
console.log(globalVar); // accessing the global variable within a function
}

sayHello(); // output: "Hello, world!"

In this example, the variable globalVar is declared outside of any function, making it a global variable. The sayHello function can access and print the value of globalVar using the console.log statement. When sayHello is called, it outputs the value of globalVar.