prototype 属性使您有能力向对象添加属性和方法。

语法：

object.prototype.name=value

例子：

<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);employee.prototype.salary=null;bill.salary=20000;document.write(bill.salary);</script>

输出：

20000

javascript Array对象prototype属性