JavaScript prototype 属性

 

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

 

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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