JavaScript constructor属性

Definition and Usage
定义与用法
The constructor property is a reference to the function that created an object.
constructor属性是所建立对象的函数参考
Syntax
语法
object.constructor

Example 1
举例
In this example we will show how to use the constructor property:
在这个举例中我们将展示如何使用constructor属性：
<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:
输出结果为：
This is an Array

Example 2
举例2
In this example we will show how to use the constructor property:
在这个举例中我们将展示如何使用constructor属性：
<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:
输出结果为：
function employee(name, jobtitle, born)
{this.name = name; this.jobtitle = jobtitle; this.born = born;}

Try-It-Yourself Demos
尝试与演示
constructor - example 1
In this example we will show how to use the constructor property.
在这个举例中我们将展示如何使用constructor属性
constructor - example 2
In this example we will show how to use the constructor property.
在这个举例中我们将展示如何使用constructor属性
 
http://www.w3pop.com/learn/view/doc/jsref_constructor_array/