Achieve static objects with JAVASCRIPT, static methods and static properties

Javascript object-oriented features of the language is weak, other object-oriented languages ​​when creating a class just use the static keyword to specify the class as a static class, Javascript does not provide a keyword such as static, Javascript also have to make a "static" characteristics only by Some "clever but useless" the.

A code implementations include two kinds of static methods / attributes of a class is a static properties and static methods, static methods and other properties, non-static class code description are written in each line in the code comments, where not repeat.

PLAIN TEXT

JAVASCRIPT:

 

1. /****************************************
2. * method one
3. * Classes, methods, properties are static type
4. * You can not create an instance
5. *****************************************/
6. var   time = {  
7.     today:   ‘2009-3-8′,
8.     weather:   ‘rain’,
9.     show:   function ( )   {
10.           alert ( ‘Today is ‘  +   this. today );
11.       }
12. };
13.  
14. // static object can be used directly, without having to create an instance
15. alert ( ‘It is ‘  + Time. weather  +   ‘ today.’ );
16. Time. show ( );
17.  
18. // The following code will be wrong, because the static class can not create an instance
19. // var t = new Time ();
20. //t.show();
21.  
22. /****************************************
23. * Method Two
24. * Ordinary objects, have both static and non-static properties, methods
25. * Can be instantiated
26. * Note:
27. * 1. Static method / property using the class name to access
28. * 2. Non-static method / property using the instance name to access
29. *****************************************/
30. function  Person ( name )   {
31.       // non-static properties
32.       this. name  =   name;
33.       // non-static method
34.       this. show  =   function ( )   {
35.           alert ( ‘My name is ‘  +   this. name  +   ‘.’ );
36.       }
37. }
38. // add static properties, but every man a mouth
39. Person. mouth  =   1;
40. // add a static method, cried
41. Person. cry  =   function ( )   {
42.       Alert ( 'Wa Wa Wa ...' ) ;
43. };
44. // add non-static properties using the prototype keyword, each person's teeth may not be as much
45. Person. prototype. teeth  =   32;
46.  
47. // non-static methods must be accessed through instances of the class
48. var  me =   new  Person ( ‘Zhangsan’ );
49. //使用非静态方法、属性
50. me. show ( );
51. alert ( ‘I have ‘  + me. teeth  +   ‘ teeth.’ );
52. //使用静态方法、属性
53. Person. cry ( );
54. alert ( ‘I have ‘  + Person. mouth  +   ‘ mouth.’ );

转载于:https://www.cnblogs.com/200831856/archive/2009/09/15/javascript_static_1.html