The JavaScript Switch Statement

Use the switch statement to select one of many blocks of code to be executed.



Syntax
Code:
switch(n)
{
case 1:
    execute code block 1
      break;
case 2:
    execute code block 2
      break;
default:
  code to be executed if n is different from case 1 and 2
}
This is how it works: First we have a single expression n (most often a variable), that is evaluated once. The value of the expression is then compared with the values for each case in the structure. If there is a match, the block of code associated with that case is executed. Use break to prevent the code from running into the next case automatically.

Example
Code:
<script type="text/javascript">
//You will receive a different greeting based
//on what day it is. Note that Sunday=0,
//Monday=1, Tuesday=2, etc.

var d=new Date();
var theDay=d.getDay();
switch (theDay)
{
case 5:
      document.write("Finally Friday");
      break;
case 6:
      document.write("Super Saturday");
      break;
case 0:
      document.write("Sleepy Sunday");
      break;
default:
      document.write("I'm looking forward to this weekend!");
}
</script>
Try it yourself