对象转为字符串

/***以字符串行书输出一个OBJ**便于查看对象的值*****/
var obj2String = function(_obj) {
    var t = typeof(_obj);
    if (t != ‘object‘ || _obj === null) {
        // simple data type
        if (t == ‘string‘) {
            _obj = ‘"‘ + _obj + ‘"‘;
        }
        return String(_obj);
    } else {
        if (_obj instanceof Date) {
            return _obj.toLocaleString();
        }
        // recurse array or object
        var n, v, json = [],
        arr = (_obj && _obj.constructor == Array);
        for (n in _obj) {
            v = _obj[n];
            t = typeof(v);
            if (t == ‘string‘) {
                v = ‘"‘ + v + ‘"‘;
            } else if (t == "object" && v !== null) {
                v = this.obj2String(v);
            }
            json.push((arr ? ‘‘: ‘"‘ + n + ‘":‘) + String(v));
        }
        return (arr ? ‘[‘: ‘{‘) + String(json) + (arr ? ‘]‘: ‘}‘);
    }
};