[javascript| basic concept |object] learning notes

Objects: Collections of data and features

Create object: New Object type name

e.g.: var o = new Object (); or var o = new Object (omitted (), not recommended) or var o = {} (Create object literal)--object instance

Each instance of the object type has any properties and methods saved by the object type:

Constructor: Holds the function that is used to create the current object, such as the constructor of the preceding O object instance is Object

hasOwnProperty (PropertyName): detects whether a given property exists in the current object instance (not in the instance's prototype), returns a Boolean value, and PropertyName specifies e.g as a string.: O.hasownproperty ("name")

isPrototypeOf (object): Detects if the incoming object is a prototype of another object, Object1.isprototypeof (OBJECT2), returns a Boolean value (Object2 's prototype chain contains Object1, Returns true if the OBJECT2 prototype chain does not contain Object1 or object2 is not an object and will return false)

propertyIsEnumerable (PropertyName): Used to detect whether a given property can be enumerated with a for-in statement, specified as a string

Tolocalstring (): Returns the string representation of an object that corresponds to the region of the execution environment

ToString (): Returns the string representation of an object

ValueOf (): Returns the object itself

[javascript| basic concept |object] learning notes