Functions can be given any number of values. The important thing to observe is that the data types in the function call correspond to the data type in the data header. Otherwise, an error will be generated if the function performs a computation inappropriate for the data type. For example, if variables, x, y, and z, are passed to function showMe(), and the function contains statements that assume that x = string y = number z = url then the variables in the function call showMe(myString, myNumber, myUrl) must correspond to the function definition in that order. If 'myNumber' were a string and the function tried to multiply it, for example, the computation would be incorrect.
<script language="JavaScript">
<!--
function showMe(x, y, z)
{
document.write("<h2>" + x + "</h2>");
//do some math
var result = y * 2;
document.write("<p>You've seen this picture " + result + " times.</p>");
//get a picture
document.write("<img src=" + z + " width=\"203\" height=\"153\"><br clear=\"right\"><br />");
return true;
}
// -->
</script>
Script in <body> calls the function:
<script language="JavaScript"> <!-- var myString = "Yet another cat picture"; var myNumber = 67; var myUrl = "../images/pictures/cat2.jpg"; showMe(myString, myNumber, myUrl); // --> </script>