转载：http://www.w3school.com.cn/jsref/jsref_prototype_array.asp
prototype 属性使您有能力向对象添加属性和方法。
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<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
JS中创建类，即function 此列中employee为创建的类。
var bill=new employee("Bill Gates","Engineer",1985); //实例化employee类