JavaScript prototype ÊôÐÔ

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The prototype property allows you to add properties and methods to an
object.
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Syntax
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object.prototype.name=value
Example 1
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In this example we will show how to use the prototype property to add a
property to an object:
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<script type="text/javascript">
function employee(name,jobtitle,born)
{
this.name=name
this.jobtitle=jobtitle
this.born=born
}
var fred=new employee("Fred Flintstone","Caveman",1970)
employee.prototype.salary=null
fred.salary=20000
document.write(fred.salary)
</script>
The output of the code above will be:
Êä³ö½á¹ûΪ£º
20000