1 　　 function copy(obj){   //浅拷贝 2         var result = {}; 3         for(var attr in obj){ 4             result[attr] = obj[attr]; 5         } 6         return result; 7     } 8  9     function copy(obj){   //深拷贝10         var result = {};11         for(var attr in obj){12             if(typeof obj[attr] == 'object'){13                 result[attr] = copy(obj[attr]);14             }15             else{16                 result[attr] = obj[attr];17             }18         }19         return result;20     }