JS 克隆数据

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function clone(obj){     var type = Object.prototype.toString.call(obj).slice(8,-1).toLowerCase();     if(type=='object'){         var json = {};         for(i in obj){             if(obj.hasOwnProperty(i)){                 json[i] = clone(obj[i]);             }         }         return json;     }else if(type=='array'){         var arr = [];         for(var i=0; i<obj.length; i++){             arr[i] = clone(obj[i]);         }         return arr;     }else{         return obj;     } }