JavaScript Advanced Programming-the sixth chapter of object-oriented programming

Create two main forms of an object, create an object instance, and create objects literal

Object contains properties and methods

Data

, attributes have four attributes that describe the behavior of the property, and they are:

Whether the configurable (configurable) can be deleted or modified to be accessor properties

Whether the Enumerable (enumeration) can be for-in

Writeable (writable) ability to modify property values

Value (value) defaults to undefined, reading data from this location or saving the new value to this location

eg

var person = {} ';

Object.defineproperty (person, "name", {writeable:false,value: "fff"});//person.name becomes read-only.

However, it is important to note that the Configurable:false attribute in Object.defineproperty () is not configurable, and cannot be used except for the writeable, and cannot be passed: True to change back,

JavaScript Advanced Programming-the sixth chapter of object-oriented programming