JavaScript constructor 属性

定义和用法

constructor 属性返回对创建此对象的数组函数的引用。

语法

object.constructor

实例

例子 1

在本例中，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>

输出：

This is an Array

例子 2

在本例中，我们将展示如何使用 constructor 属性：

<script type="text/javascript">function employee(name,job,born){this.name=name;this.job=job;this.born=born;}var bill=new employee("Bill Gates","Engineer",1985);document.write(bill.constructor);</script>

输出：

function employee(name, jobtitle, born){this.name = name; this.jobtitle = job; this.born = born;}