代碼段：通過索引獲取對應的Excel列名; 索引從0開始，返回形如 A,B,C,...,Z,AA,AB,...,AZ,BA,...,ZZ,AAA,AAB,......

項目需要，今天寫了個前端導出Excel的方法

/**
 * 通過索引獲取對應的Excel列名
 * 索引從0開始，返回形如 A,B,C,...,Z,AA,AB,...,AZ,BA,...,ZZ,AAA,AAB,......
 */
var getExcelColumnName = function (index) {

    var colName = '';

    if (index >= 26) {
        colName = getExcelColumnName(index / 26 - 1);
        colName += String.fromCharCode(65 + index % 26);
    } else {
        colName += String.fromCharCode(65 + index);
    }

    return colName;
};