属性使您有能力向对象添加属性和方法
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); //20000原文：http://www.cnblogs.com/zhiyong666/p/5828659.html