Details about how to create objects in JS in multiple ways, and js in multiple ways

Details about how to create objects in JS in multiple ways, and js in multiple ways

1. Create a built-in object

var girl=new Object();   girl.name='hxl';   console.log(typeof girl); 

2. Factory mode and parasitic constructor Mode

Function Person (name) {var p = new Object (); // instantiate p internally. name = name; p. say = function () {console. log ('My name is '+ p. name);} return p; // Note: Be sure to return} var girl = Person ('haoxioli'); girl. say ();

3. Create a constructor

Var Product = function (name) {this. name = name; this. buy = function () {console. log ('the brand of my clothes is '+ this. name) ;}} var pro = new Product ('devs'); pro. buy ();

4. Prototype creation. Disadvantages: Each attribute in the instance may be different.

Var Role = function () {} Role. prototype. name = {nickName: 'Nick '}; var boy = new Role (); boy. name. nickName = 'Liu bin'; console. log (boy. name. nickName); // Liu Xiaobing var girl = new Role (); girl. name. nickName = 'hao Xiaoli '; console. log (boy. name. nickName); // hao Xiaoli, because the instance object can modify the value of the referenced object in the prototype console. log (girl. name. nickName); // hao Xiaoli

5. hybrid mode: Prototype + constructor. You can put the attributes that are not modified by the instance into the constructor and modify the attributes in the prototype.

Var Role = function () {this. name = {nickName: 'aaa'};} Role. prototype. age = 30; var boy = new Role (); boy. name. nickName = 'boys'; console. log (boy. name. nickName); // boy var girl = new Role (); girl. name. nickName = 'girer'; console. log (boy. name. nickName); // boy, the instance does not modify the value in the constructor console. log (girl. name. nickName); // girl

6. literal form

Var cat = {name: 'Lucy ', age: 3, sex: 'mother'}; // converts an object to a string console. log (JSON. stringify (cat); // {"name": "lucy", "age": 3, "sex": "Mother"} var dog = '{"name ": "john", "sex": "public"} '; console. log (JSON. parse (dog ). name); // convert a string to an object

7. Copy Mode

Function extend (tar, source) {for (var I in source) {tar [I] = source [I];} return tar;} var boy = {name: 'drunk knight ', age: 20}; var person = extend ({}, boy); console. log (person. name );

8. Third-party framework

// First introduce the package <script src = 'js/base2.js'> </script> // base2 framework, Base. both extend and constructor have fixed usage var Animal = Base. extend ({constructor: function (name) {this. name = name ;}, say: function (meg) {console. log (this. name + ":" + meg) ;}}); new Animal ('lily '). say ('fish ');

Another third-party framework

<Script src = 'js/simplejavascriptinheritance. js'> </script> // simplejavascriptinheritance framework, Class. both extend and init have fixed usage var Person = Class. extend ({init: function (name) {this. name = name ;}}); var p = new Person (); p. name = 'over'; console. log (p. name );

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