对字符串进行简单的加密处理； 也可以解密； 输入初始字符串，点击“加密”，显示加密后的字符串，在点击“解密”，显示解密后的字符串-On a simple string encryption processing also can decrypt enter the initial string, click the "encryption" to show the string after encryption, click the "declassified" to show