将字符串转化为字符数组 将一个十六进制的字符串，转化为一个字符数组 检查数据格式是否正确，字符串里是否包含非十六进制数码字符（0~9，A~F） 检查数据格式是否正确，字符串里是否包含非十进制数码字符（0~9）-The string into an array of characters　a hexadecimal string into an array of characters　check the data in the correct format, whether to include non-digital hexadecimal characters (0 to 9, the string, A ~ F )　check the data in the correct format, whether to include non-metric digital characters in the string (0 to 9)