js递归深复制对象

        function isArray(o){
            return  .prototype.toString.call(o)=='[  Array]';
        }
        function deepCopy(obj){
            var newObj ;
            if(isArray(obj)){
                newObj = [] ;
            }else if(typeof obj==" "){
                newObj = {} ;
            }else if(typeof obj=="function"){
                return eval(obj.toString())
            }else{
                return obj ;
            }
            for(var key in obj){
                newObj[key] = arguments.callee(obj[key]) ;
            }
            return newObj ;
        }