JavaScript将JSON转换为字符串

功能如题，代码如下

	var json2str = function(json){
        var type = typeof json;
        if(type === 'number' || type === 'boolean'){
            return json;
        }else if(json === null){
            return 'null';
        }else if(type === 'string'){
            return '"' + json.toString() + '"';
        }else if(type === 'function'){
            return 'null';
        }else if(type === 'object'){
            if(json instanceof Date){
                return '"' + json.toString() + '"';
            }else if(json instanceof Array){
                var arr = [];
                var jlen = json.length;
                for(var i = 0; i < jlen; i++){
                    arr.push(arguments.callee(json[i]));
                }
                console.log(arr);
                return '[' + arr.join(',') + ']';
            }else{
                var obj = [];
                for(var key in json){
                    obj.push('"' + key + '"' + ':' + arguments.callee(json[key]));
                }
                return '{' + obj.join(',') + '}';
            }
        }
    }