以下的 Java成文法对我非常混淆。 任何人都能够帮助我理解。 为什么人 Y没有原型财产。
PersonX = function(){};
PersonY = new function(){};
alert(PersonX.prototype);
alert(PersonY.prototype);
以下的 Java成文法对我非常混淆。 任何人都能够帮助我理解。 为什么人 Y没有原型财产。
PersonX = function(){};
PersonY = new function(){};
alert(PersonX.prototype);
alert(PersonY.prototype);
PersonX = function(){};
在<代码>PersonX中提及匿名功能。 <代码>PersonX系指一种功能。
PersonY = new function(){};
将新设立的匿名构造功能实例列入<代码>PersonY。 <代码>PersonY系指物体。
关于原型,<代码>PersonY。 但是,由于在之前没有建筑设计人所附的特性和方法:,也没有>。 即时,有
You can actually check PersonY
s prototype by doing console.log(PersonY)
. You will see that it has a prototype property (I see it as __proto__
in Chrome) which is "blank". But it has 2 hidden properties, constructor
which is the constructor function that made the object, and another __proto__
which leads you to the next "chain link" which would be the Object
object.
* 绝迹,因为原型是一个链条。 这一原型水平可能为空白,但下一个较高的原型可能具有,或在这种情况下确实有特性和方法。
Object prototype -> Constructor prototype -> Your Instance will have:
- toString() - blank - toString()
- hasOwnProperty() - hasOwnProperty()
- and more... - and more...
- ...but nothing from Constructor
这是因为,它实际上是一种作为功能复制件的瞬时射出的物体;该原型在创建时确实只具有意义,因此,一旦创立,就没有任何逻辑的构造。
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