prototype 属性使您有能力向对象添加属性和方法。
object.prototype.name=value
<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
原文:https://www.cnblogs.com/bi-hu/p/14754381.html