//加密
function encrypto( str, xor, hex ) {
 if ( typeof str !== 'string' || typeof xor !== 'number' || typeof hex !== 'number') {
 return;
 }
 let resultList = []; 
 hex = hex <= 25 ? hex : hex % 25;
 for ( let i=0; i<str.length; i++ ) {
 // 提取字符串每個(gè)字符的ascll碼
 let charCode = str.charCodeAt(i);
 // 進(jìn)行異或加密
 charCode = (charCode * 1) ^ xor;
 // 異或加密后的字符轉(zhuǎn)成 hex 位數(shù)的字符串
 charCode = charCode.toString(hex);
 resultList.push(charCode);
 }
 let splitStr = String.fromCharCode(hex + 97);
 let resultStr = resultList.join( splitStr );
 return resultStr;
}

//解密
function decrypto( str, xor, hex ) { 
 if ( typeof str !== 'string' || typeof xor !== 'number' || typeof hex !== 'number') {
 return;
 }
 let strCharList = [];
 let resultList = []; 
 hex = hex <= 25 ? hex : hex % 25;
 // 解析出分割字符
 let splitStr = String.fromCharCode(hex + 97);
 // 分割出加密字符串的加密后的每個(gè)字符
 strCharList = str.split(splitStr);
 for ( let i=0; i<strCharList.length; i++ ) {
 // 將加密后的每個(gè)字符轉(zhuǎn)成加密后的ascll碼
 let charCode = parseInt(strCharList[i], hex);
 // 異或解密出原字符的ascll碼
 charCode = (charCode * 1) ^ xor;
 let strChar = String.fromCharCode(charCode);
 resultList.push(strChar);
 }
 let resultStr = resultList.join('');
 return resultStr;
}