JavaScript constructor属性

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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属性为所建立对象的函数参考

Syntax
语法

object.constructor

Example 1
举例 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：

<script type="text/javascript">

var test=new Date()
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 Date

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.
如何使用constructor属性

constructor - example 2
In this example we will show how to use the constructor property.
如何使用constructor属性