园子里使用的jQuery.json

今天突然看到了园子里使用的jQuery.json，把源码复制在这里，以后会有用，免得忘了。

(function($) {

    $.toJSON = function(o) 

    {

        if (typeof (JSON) == 'object' && JSON.stringify)

            return JSON.stringify(o);

        var type = typeof (o);

        if (o === null)

            return "null";

        if (type == "undefined")

            return undefined;

        if (type == "number" || type == "boolean")

            return o + "";

        if (type == "string")

            return $.quoteString(o);

        if (type == 'object') 

        {

            if (typeof o.toJSON == "function")

                return $.toJSON(o.toJSON());

            if (o.constructor === Date) 

            {

                var month = o.getUTCMonth() + 1;

                if (month < 10)

                    month = '0' + month;

                var day = o.getUTCDate();

                if (day < 10)

                    day = '0' + day;

                var year = o.getUTCFullYear();

                var hours = o.getUTCHours();

                if (hours < 10)

                    hours = '0' + hours;

                var minutes = o.getUTCMinutes();

                if (minutes < 10)

                    minutes = '0' + minutes;

                var seconds = o.getUTCSeconds();

                if (seconds < 10)

                    seconds = '0' + seconds;

                var milli = o.getUTCMilliseconds();

                if (milli < 100)

                    milli = '0' + milli;

                if (milli < 10)

                    milli = '0' + milli;

                return '"' + year + '-' + month + '-' + day + 'T' + 

                hours + ':' + minutes + ':' + seconds + '.' + milli + 'Z"';

            }

            if (o.constructor === Array) 

            {

                var ret = [];

                for (var i = 0; i < o.length; i++)

                    ret.push($.toJSON(o[i]) || "null");

                return "[" + ret.join(",") + "]";

            }

            var pairs = [];

            for (var k in o) {

                var name;

                var type = typeof k;

                if (type == "number")

                    name = '"' + k + '"';

                else if (type == "string")

                    name = $.quoteString(k);

                else

                    continue;

                if (typeof o[k] == "function")

                    continue;

                var val = $.toJSON(o[k]);

                pairs.push(name + ":" + val);

            }

            return "{" + pairs.join(", ") + "}";

        }

    };

    $.evalJSON = function(src) 

    {

        if (typeof (JSON) == 'object' && JSON.parse)

            return JSON.parse(src);

        return eval("(" + src + ")");

    };

    $.secureEvalJSON = function(src) 

    {

        if (typeof (JSON) == 'object' && JSON.parse)

            return JSON.parse(src);

        var filtered = src;

        filtered = filtered.replace(/\\["\\\/bfnrtu]/g, '@');

        filtered = filtered.replace(/"[^"\\\n\r]*"|true|false|null|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?/g, ']');

        filtered = filtered.replace(/(?:^|:|,)(?:\s*\[)+/g, '');

        if (/^[\],:{}\s]*$/.test(filtered))

            return eval("(" + src + ")");

        else

            throw new SyntaxError("Error parsing JSON, source is not valid.");

    };

    $.quoteString = function(string) 

    {

        if (string.match(_escapeable)) 

        {

            return '"' + string.replace(_escapeable, function(a) 

            {

                var c = _meta[a];

                if (typeof c === 'string')

                    return c;

                c = a.charCodeAt();

                return '\\u00' + Math.floor(c / 16).toString(16) + (c % 16).toString(16);

            }) + '"';

        }

        return '"' + string + '"';

    };

    var _escapeable = /["\\\x00-\x1f\x7f-\x9f]/g;

    var _meta = {'\b': '\\b','\t': '\\t','\n': '\\n','\f': '\\f','\r': '\\r','"': '\\"','\\': '\\\\'};

})(jQuery);