js继承之圣杯模式代码实例

js继承之圣杯模式代码实例

function inherit( target , origin){  
          function f();  
          f.prototype = origin.prototype;  
          target.prototype = new f();  
          target.prototype.constructor = target;  //把target的构造函数指向归位  
          target.prototype.uber= origin.prototype; //为了让我们知道target真正继承自谁  
      }  

var inherit = (function(){  
         var f =function (){} ;  
         return function(target,origin){  
             f.prototype = origin.prototype;  
             target.prototype.constructor =  target;  
             target.prototype.uber = origin.prototype;  
         }  
     }())