javascript 内部属性[[Class]]

Posted by bower on September 22, 2011
javascript

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see url jvascript object 内部属性, 每一个对象都有这些内部属性

Internal Property Value Type Domain Description
[[Prototype]] Object or Null The prototype of this object.
[[Class]] String A String value indicating a specification defined classification of objects.
[[Extensible]] Boolean If  can freshman dating senior true, own properties may be added to the object.
[[Get]] SpecOp(propertyName) →
any
Returns the value of the named property.
[[GetOwnProperty]] SpecOp (propertyName) → Undefined orProperty Descriptor Returns the Property Descriptor of the named own property of this object, or gratis dating sider i norge undefined if absent.
[[GetProperty]] SpecOp (propertyName) → Undefined or Property Descriptor Returns the fully populated Property Descriptor of the named property of this object, or  http://azortin.pl/?rtysa=opcje-binarne-ranking&d36=12 undefined if absent.
[[Put]] SpecOp (propertyName, any, Boolean) Sets the specified named property to the value of the second parameter. The flag controls failure handling.
[[CanPut]] SpecOp (propertyName) → Boolean Returns a Boolean value indicating whether a [[Put]] operation withpropertyName can be performed.
[[HasProperty]] SpecOp (propertyName → Boolean) Returns a Boolean value indicating whether the object already has a property with the given name.
[[Delete]] SpecOp (propertyName, Boolean) → Boolean Removes the specified named own property from the object. The flag controls failure handling.
[[DefaultValue]] SpecOp (Hint) → primitive Hint is a String. Returns a default value for the object.
[[DefineOwnProperty]] SpecOp (propertyName, PropertyDescriptor, Boolean) → Boolean Creates or alters the named own property to have the state described by a Property Descriptor. The flag controls failure handling.

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order premarin from mexico he value of the [[Class]] internal property is defined by this specification for every kind of built-in object. The value of the [[Class]] internal property of a host object may be any String value except one of "Arguments", "Array", "Boolean", "Date", "Error", "Function", "JSON", "Math", "Number", "Object", "RegExp", and "String". The value of a [[Class]] internal property is used internally to distinguish different kinds of objects. Note that this specification does not provide any means for a program to access that value except through Object.prototype.toString

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http://www.idfopoitiers.fr/maskoer/256 class这个属性是用来识别对象类别的比如”Arguments”, “Array”, “Boolean”, “Date”, 而且这个属性不可写, 也不可直接读, 只能通过 Object.prototype.toString()来得到。

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