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Variable in JavaScript

How to declare a variable in JavaScipt?

Variables are case sensitive and must start with an alphabhet letter or a underscore (_).

<script>
        var firstName;
        var lastName = "Funda";
        myName = "Sheo";

  function MyFunction(){
     var a = 20;
         b = 30;
  }
</script>

In the above code snippet

• The 1st line declares the firstName variable.
• The 2nd line declares the last name variable and assign value.
• 3rd line assigns a value to undeclared variable that automatically creates a valid variable and the scope of this variable would be thorugh out the page.