一個簡單的例子：
aim: A,B,C,...,Z,AA,AB,AC.......AZ,BA,BB...BZ.
寫一個函數，給你一個數字你就能得出對應的列數，例如27對應AA，28對應AB
代碼如下：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>數字轉字母順序</title>
</head>
<body>
<div>
輸入數字:<input type = "text" class = "num">
轉換: <button type = "button" onclick = "change()">轉換</button>
<br>
轉換後的字母順序：<span id = "resultString"></span>
</div>
</body>
<script>
var change = function () {
var num = document.getElementsByClassName("num")[0].value;
var stringName = "";
if(num > 0) {
if(num >= 1 && num <= 26) {
stringName = String.fromCharCode(64 + parseInt(num));
} else {
while(num > 26) {
var count = parseInt(num/26);
var remainder = num%26;
if(remainder == 0) {
remainder = 26;
count--;
stringName = String.fromCharCode(64 + parseInt(remainder)) + stringName;
} else {
stringName = String.fromCharCode(64 + parseInt(remainder)) + stringName;
}
num = count;
}
stringName = String.fromCharCode(64 + parseInt(num)) + stringName;
}
}
console.log(stringName);
document.getElementById("resultString").innerText = stringName;
}
</script>
</html>
