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The initial value of the prototype of a Boolean object is the built-in Boolean prototype object.
The example demonstrates how to provide extensions to all instances of this class by adding a function to the prototype object.
<HTML>
<HEAD>
</HEAD>
<BODY>
<SCRIPT>
// Define a function that extends the output capabilities of Boolean objects
function yesNo()
{
if(this == true)
{
return "The switch is ON";
}
else
{
return "The switch is OFF";
}
}
// Register the new function
Boolean.prototype.yesNo = yesNo;
// Create a Boolean object and test the Boolean.yesNo() method
myBoolean = new Boolean(true);
document.write(myBoolean.yesNo());
document.write("<BR>");
myBoolean = !myBoolean;
document.write(myBoolean.yesNo());
document.write("<BR>");
</SCRIPT>
</BODY>
</HTML>ECMA 262 edition 2 - section - 15.2.3.1
ECMA 262 edition 2 - section - 15.6.3.1
ECMA 262 edition 3 - section - 15.6.3.1
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JavaScript Programmer's Reference, Cliff Wootton Wrox Press (www.wrox.com) Join the Wrox JavaScript forum at p2p.wrox.com Please report problems to support@wrox.com © 2001 Wrox Press. All Rights Reserved. Terms and conditions. | ||