2016/4/19

Source: Internet
Author: User

Constructors are classes

Object-oriented:

Inherited

Packaging

Polymorphic

Constructors are also called factory methods

Is there a new way to plant?

Each function has its own function which is extremely wasteful of resources every time new, so the function object is constantly in the new birth

This will sometimes expire.

1. When new is in front of the function

function Createperson (name,sex) {var obj=new Object (); obj.name=name; obj.sex=sex; Obj.showname=function () {alert ( THIS.name)} obj.showsex=function () {alert (this.sex);} return obj;} var p1=createperson (' Hu ', ' man ');p 1.showName ();

  

function Createperson (name,sex) {   this.name=name; this.sex=sex; This.showname=function () {alert (this.name)} This.showsex=function () {alert (this.sex);}  } var p1= new Createperson (' Hu ', ' man ');p 1.showName ();

Ptototype

Save Resources

String.prototype.trim=function ()
{
Alert (This.replace (/^\s+|\s+$/g, '));
};
var a= ' Adaf ';
A.trim ();

The default specifies that the first letter of the constructor needs to be capitalized, and in the example above, Createperson is the constructor function.

2016/4/19

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