globalVariable.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Global Variable in JS</title>
</head>
<body>
    <h1>Global Variable in JS</h1>
    <script>
        // Global variable in Js
        // 1. declaring variable outside function
        var value= 500;
        document.write(value);
        function a()
        {
            document.writeln(value);
        }

        // 2. using window object
        function b()
        {
            window.data= 600;
        }
        function c()
        {
            document.writeln("variable declaration using window object : ")
            document.writeln(window.data);                  ///accessing data
        }

        //3. variable declared outside the function is added in the window object
        var key =800;
        function d()
        {
            document.writeln(window.key);
        }

        //calling the functions 
        a();
        b();
        c();
        d();
        
    </script>
    
</body>
</html>