js prototype

它的作用是向某个对象添加属性。

 

<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);

employee.prototype.salary=null;
bill.salary=20000;

document.write(bill.salary);

</script>

 

 

 

refurl:http://www.w3school.com.cn/js/jsref_prototype_array.asp