What are the ways Objects creates objects?
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Data Structures
Data Types: numbers, strings, booleans and arrays.
Boolean
If it is not set, or if it is set to false, "", "false,undefined,NaN", or "true", otherwise it is set to "true".
Arrays
Var myCars=new Array (); var myCars=new Array ("Saab", "Volvo", "BMW"); var myCars= ["Saab", "Volvo", "BMW"]
Objects
There are two ways to create objects
(1) object literal notation
Var myObj = {type: 'fancy',age:24, speak: function () {} / / method}
(2) object constructor
Var myObj = new Object (); / / using a built-in constructor called ObjectmyObj ["name"] = "Charlie"; myObj.name = "Charlie"
Custom constructor
Function Rabbit (adjective) {this.adjective = adjective; var age=12; / / private cannot modify this.describeMyself = function () {console.log ("I am a" + this.adjective + "rabbit");};} var rabbit1 = new Rabbit ("fluffy"); / / className.prototype.newMethod = function () {} add method Rabbit.prototype.describeMyself = function () {} Object Oriented to a class
Inherit
/ the original Animal class and sayName methodfunction Animal (name, numLegs) {this.name = name; this.numLegs = numLegs;} Animal.prototype.sayName = function () {console.log ("Hi my name is" + this.name);}; / / define a Penguin classfunction Penguin (name) {this.name = name; this.numLegs = 2;} / / set its prototype to be a new instance of AnimalPenguin.prototype = new Animal (); var p = new Penguin ("Timmy"); p.sayName ()
Custom declared classes inherit from the Object class
/ / Object.prototype itself is an object// what is this "Object.prototype" anyway...?var prototypeType = typeof Object.prototype;console.log (prototypeType); / / object// now let's examine itinervar hasOwn = Object.prototype.hasOwnProperty ("hasOwnProperty"); console.log (hasOwn); / / true
Privatized members and methods
/ * Public properties can be accessed from outside the classPrivate properties can only be accessed from within the class*/function Person (first,last,age) {this.firstname = first; this.lastname = last; this.age = age; var bankBalance = 7500; / / var this.bankBalance (no this) var returnBalance = function () {return bankBalance;}; / / create the new function here this.askTeller = function () {return returnBalance }} var john = new Person ('John','Smith',30); console.log (john.returnBalance); var myBalanceMethod = john.askTeller (); var myBalance = myBalanceMethod (); console.log (myBalance); "how Objects creates objects" ends here. Thank you for reading. If you want to know more about the industry, you can follow the website, the editor will output more high-quality practical articles for you!
