Function is a set of statements recognized by a name and can be used as and when required (it is reusable).
A function can accept parameters and can return a value back to the calling position. The parameters accepted by a function can be used in the code of that function.
function functionname(var1, var2,..)
{
lines to be kept under this name return(variablename)
}
<html>
<head>
</head>
<body>
<script type="text/javascript">
function max(m)
{
var x,y
y=m[0];
for(x=0;x<m.length;x++)
{
if(m[x]>y)
{
y=m[x]
}
}
return(y)
}
var m=new Array()
m[0]=50
m[1]=12
m[2]=99
m[3]=45
m[4]=120
m[5]=110
m[6]=22
m[7]=106
i=max(m)
document.write("Maximum Value is "+i)
</script>
</body>
</html>
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