Definition and Usage
定义与用法

The prototype property allows you to add properties and methods to an object.
prototype属性允许你向一个对象添加属性和方法

Syntax
语法

object.prototype.name=value

Example 1
实例

In this example we will show how to use the prototype property to add a property to an object:
在下面的例子中，我们将演示如何用prototype属性来向一个对象增加一个属性：

<script type="text/javascript">

function employee(name,jobtitle,born)
{
this.name=name
this.jobtitle=jobtitle 
this.born=born
}

var fred=new employee("Fred Flintstone","Caveman",1970)

employee.prototype.salary=null

fred.salary=20000

document.write(fred.salary)

</script>

The output of the code above will be:
输出结果为：

20000

Try-It-Yourself Demos
互动演练

prototype
In this example we will show how to use the prototype property.
在本例中，我们将演示如何应用prototype属性

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