Javascript递归实现生成A到ZZZ的字符串

 写出来放这里，以后可以再次使用。

 

//Sequential from A to ZZZ based inputfunction Sequential(input){var str = new Array("A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z");var initials = input ;if(initials.length == 1){if(initials != "Z"){for(var i =0 ; i < str.length; ++i){if(str[i] == initials){initials = str[i + 1];break;}}}else{initials = "AA";}}else if(initials.length == 2){var firstChar = initials.charAt(0);var lastChar = initials.charAt(1);if(firstChar == 'Z' && lastChar == 'Z'){initials = "AAA";}else{if(lastChar != 'Z'){//increment the lastChar from A to Zinitials = firstChar + recomputeInitials(lastChar);}else{//increment the firstChar from A to Zinitials = recomputeInitials(initials.charAt(0)) + lastChar;}}}else if(initials.length == 3){var firstChar = initials.charAt(0);var middleChar = initials.charAt(1);var lastChar = initials.charAt(2);if(firstChar == 'Z' && middleChar == 'Z' && lastChar == 'Z'){}else{if(lastChar != 'Z'){initials = firstChar + middleChar + recomputeInitials(lastChar);}else if(lastChar == 'Z' && middleChar != 'Z'){initials = firstChar + recomputeInitials(middleChar) + lastChar;}else if(lastChar == 'Z' && middleChar == 'Z' && firstChar != 'Z'){initials = recomputeInitials(firstChar) + middleChar + lastChar;}}}else{initials = initials.substring(0,3);//just return the first 3 chars}return initials;}

 

如Sequential("DFS")  => "DFT"