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JavaScript constructor 属性

出处:互联网   整理: 软晨网（RuanChen.com）   发布: 2009-03-04   浏览: 422 ::
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Definition and Usage
定义与用法

The constructor property is a reference to the function that created an object.
constructor属性是创建对象的参考

Syntax
语法

object.constructor

Example 1
实例1

In this example we will show how to use the constructor property:
在本例中，我们将演示如何应用constructor属性：

<script type="text/javascript">
var test=new String()
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 a String

Example 2
实例2

In this example we will show how to use the constructor property:
在本例中，我们将演示如何应用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
互动演练

constructor - example 1
In this example we will show how to use the constructor property.
在本例中我们将演示如何应用constructor属性

constructor - example 2
In this example we will show how to use the constructor property.
在本例中我们将演示如何应用constructor属性

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