JS設計模式（一）Mixin classes

Mixin classes provide a way to have objects and classes share methods without being in
a parent-child relationship. It should be used where you have general-purpose methods that
you want to share among several dissimilar classes. It is possible to share all of the methods in
a mixin class, or just a few of them, using the augment function.

 

Mixin classes提供了一種分享類方法的方式。這種分享是沒有父子繼承關係的。

 

將基類的方法放在一個沒有構造函數的類中。使用augment的方法將其複製到其他之類中。

1. /* Augment function, improved. */
2. function augment(receivingClass, givingClass) {
3.     if(arguments[2]) { // Only give certain methods. 繼承個別方法 
4.         for(var i = 2, len = arguments.length; i < len; i++) {
5.                 receivingClass.prototype[arguments[i]] = givingClass.prototype[arguments[i]];
6.                 }
7.             }
8.             else { // Give all methods. 繼承所有 
9.             for(methodName in givingClass.prototype) {
10.                 if(!receivingClass.prototype[methodName]) {
11.                     receivingClass.prototype[methodName] = givingClass.prototype[methodName];
12.                 }
13.         }
14.     }
15. }

用法是 augment(Author, Mixin, 'serialize');

 

傳統意義上的繼承如下：

1. function CliBase(){};
2.  function CliUser(){
3.   CliBase.call();
4.   this.name;
5.  }