JS的一些数据类型的转换

bytes 转 16进制字符串

    function bytesToHex(bytes) {
        for (var hex = [], i = 0; i < bytes.length; i++) {
            hex.push((bytes[i] >>> 4).toString(16));
            hex.push((bytes[i] & 0xF).toString(16));
        }
        return hex.join("");
    }

16进制字符串 转 bytes

    fun