Object creation mode and inheritance Implementation of JavaScript2 Constructor

Object creation mode and inheritance Implementation of JavaScript2 Constructor

The first mode:

Function Person () {} Person. prototype. say = function () {alert ('hello');} var person = new Person (); person. say (); // hello

According to the first mode, let's talk about the implementation of inheritance:

Function Person () {} Person. prototype. say = function () {alert ('hello');} function Man () {} Man. prototype = new Person () var man = new Man (); man. say (); // hello

Second mode:

Function Person () {var _ this = {}; // create an empty object _ this. say = function () {alert ('hello')}; return _ this;} function person = new Person (); person. say (); // hello

Inheritance of the second mode:

Function Person () {var _ this = {}; // create an empty object _ this. say = function () {alert ('hello')}; return _ this;} function Man () {var _ this = new Person (); return _ this ;} var a = new Man ();. say (); // hello

Author: Luo Jianyuan