JavaScript constructorÊôÐÔ

Definition and Usage
¶¨ÒåÓëÓ÷¨The constructor property is a reference to the function that created an object.
constructorÊôÐÔÊÇËù½¨Á¢¶ÔÏóµÄº¯Êý²Î¿¼Syntax
Óï·¨object.constructor
Example 1
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In this example we will show how to use the constructor property:
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<script type="text/javascript">
var test=new Array()
if (test.constructor==Array)
{document.write("This is an Array")}
if (test.constructor==Boolean)
{document.write("This is a Boolean")}
if (test.constructor==Date)
{document.write("This is a Date")}
if (test.constructor==String)
{document.write("This is a String")}
</script>
The output of the code above will be:
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This is an Array
Example 2
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In this example we will show how to use the constructor property:
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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)
document.write(fred.constructor)
</script>
The output of the code above will be:
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function employee(name, jobtitle, born)
{this.name = name; this.jobtitle = jobtitle; this.born = born;}
Try-It-Yourself Demos
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constructor - example 1
In this example we will show how to use the constructor property.
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constructor - example 2
In this example we will show how to use the constructor property.
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http://www.w3pop.com/learn/view/doc/jsref_constructor_array/