1. 淺層的數組或對象拷貝(也就是數組中不包含對象或數組)
****1.1 通過slice或者concat方法****
例如：數組2復制數組1

    var arr2 = arr1.slice(0);
    var arr2 = arr1.concat();

****1.2 遍歷數組或對象方法****

    var simpleCopy = function(o){
         if (o instanceof Array) 
         { 
                var n = []; 
                for (var i = 0; i < o.length; ++i)
                    n[i] = o[i];  
                return n; 
          } 
          else if (o instanceof Object) 
          { 
                var n = {} ;
                for (var i in o) 
                      n[i] = o[i];
                return n; 
          }
     }

2. 實現拷貝包含對象或者數組的這種情況呢？那么就通過遞歸拷貝來實現。

  var deepCopy = function(o) { 
       if (o instanceof Array)
       { 
             var n = [];
             for (var i = 0; i < o.length; ++i) 
                   n[i] = deepCopy(o[i]); 
             return n; 
       } 
      else if (o instanceof Object) 
      {     
            var n = {} ;
            for (var i in o) 
                n[i] = deepCopy(o[i]); 
           return n; 
      } 
      else    return o; 
  }