JavaScript Basic Learning (iv)-object

First, the basic operation of object 1. Creation of objects

In JavaScript, you create objects in two ways: constructors and object literals .

(1) Constructors

var person = new Object ();p erson.name = "Tom";p erson.age = 22;person.say = function () {alert ("Hello");}

(2) object literal

var person = {Name: "Tom", age:22}

2. Deletion of object properties and methods

You can use the delete operator.

var person = {};p erson.name = "Tom";p erson.age = 20;person.say = function () {alert ("Hello!!!");} The delete operator deletes the properties and methods of the object delete Person.name;delete Person.say;alert (person.age); 20alert (Person.name); Undefinedalert (Person.say); Undefined

3. Traversal of objects

You can use the for in enumeration to iterate.

var person = {};p erson.name = "Tom";p erson.age = 20;person.say = function () {alert ("Hello!!!");} Traverse the object for (var attr in person) {alert (attr + "=" + Person[attr]);}

Ii. properties and methods of object 1.constructor properties

The constructor property is the constructor that holds the current object, and in the previous example, constructor saves the object method.

var person = {};p erson.name = "Tom";p erson.age = 20;person.say = function () {alert ("Hello!!!");} /* * Constructor: Save object Creation Function * Functions object () {     *[native code] *} */alert (Person.constructor)

JavaScript Basic Learning (iv)-object