javascript if switch case

simple if

<script type="text/javascript">

var d=new Date()
var time=d.getHours()
if (time<10) 
{
document.write("<b>Good morning</b>")
}
</script>

<script type="text/javascript">
//Write "Lunch-time!" if the time is 11
var d=new Date()
var time=d.getHours()
if (time==11) 
{
document.write("<b>Lunch-time!</b>")
}
</script>


if ... else
<script type="text/javascript">
//If the time is less than 10,
//you will get a "Good morning" greeting.
//Otherwise you will get a "Good day" greeting.
var d = new Date()
var time = d.getHours()
if (time < 10) 
{
document.write("Good morning!")
}
else
{
document.write("Good day!")
}
</script>

if .. else if .. else

<script type="text/javascript">
var d = new Date()
var time = d.getHours()
if (time<10)
{
document.write("<b>Good morning</b>")
}
else if (time>10 && time<16)
{
document.write("<b>Good day</b>")
}
else
{
document.write("<b>Hello World!</b>")
}
</script>


switch ... case





<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()
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>