Variable is a user given name to a memory location where user can store values and can access it using variable name.
user can give any valid variable name to store data.
Variables can store different types of data like integer,character,string, boolean,real values etc.

Syntax

   var variableName;

1	var variableName;

for all kind of variable we use var keyword then name of variable.

Declaration

      var name;
      var  age;
      var percentage;
      var grade;

var name;

var age;

var percentage;

var grade;

After declaring variables we can assign value in variable

Assignment

       name="Ram";
        age=24;
       percentage=80.50;
       grade='E';

name="Ram";

age=24;

percentage=80.50;

grade='E';

lets consider above variable to display in program

Example

Java Script Variables

           <script type="text/javascript">
            var name;
            var  age;
            var percentage;
            var grade;
            age=24;
            name="Ram";
            percentage=80.50;
           grade='E';
           document.write("Name is "+name+"<br>");
           document.write("Age is "+age+"<br>");
           document.write("Percentage is "+percentage+"<br>");
          document.write("Grade is "+grade+"<br>");
         </script>

var name;

var age;

var percentage;

var grade;

age=24;

name="Ram";

percentage=80.50;

grade='E';

document.write("Name is "+name+"<br>");

document.write("Age is "+age+"<br>");

document.write("Percentage is "+percentage+"<br>");

document.write("Grade is "+grade+"<br>");

</script>

RunInitialization
At the time of declaration variable can also be initialized.

      var name="Ram";
      var  age=24;
      var percentage=80.50;
      var grade='O';

var name="Ram";

var age=24;

var percentage=80.50;

var grade='O';

Run