JavaScript – Local and Global Variables

Local variables:

Defining a variable inside the function or block is called Local variable.
We can access them only from the same block or function.

<html>
            <head>
                        <script>
                                    function add(){
                                                var a=10;
                                                var b=20;
                                                var c=a+b;
                                                document.write(“Sum is : ” + c);
                                    }
                        </script>
            </head>
            <body>
                        <button onclick=”add()”>add</button>
            </body>
</html>

Global variables: Defining variables outside to all functions – we can them from all functions.

<html>
            <head>
                        <script>
                                    var a=5;
                                    var b=3;
                                    function add(){
                                                document.write(“Sum is : ” + (a+b));
                                    }
                                    function subtract(){
                                                document.write(“Difference is : ” + (a-b));
                                    }
                                    function multiply(){
                                                document.write(“Product is : ” + (a*b));
                                    }
                        </script>
            </head>
            <body>
                        <button onclick=”add()”>add</button>
                        <button onclick=”subtract()”>subtract</button>
                        <button onclick=”multiply()”>multiply</button>
            </body>
</html>

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