calculate memory size of javascript object, it is not a accurate value!

memorySizeOfObject.js

function memory(obj) {
    var bytes = 0;

    function size (obj) {
        if (obj !== null && obj !== undefined) {
            switch (typeof obj) {
                case 'number':  bytes += 8; break;
                case 'string':  bytes += obj.length * 2; break;
                case 'boolean': bytes += 4; break;
                case 'object':
                    if (obj[_c] === Object || obj[_c] === Array) {
                        for (var key in obj) {
                            if (!obj.hasOwnProperty(key)) {
                                continue
                            }
                            size(obj[key])
                        }
                    } else {
                        bytes += obj.toString().length * 2
                    }
                    break
            }
        }
        return bytes
    }

    return size(obj) / 1024
}