JavaScript constructor 属性
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, job, born) {this.name = name; this.job = job; this.born = born;}