Related to question Excel Sheet Column Title
Given a column title as appear in an Excel sheet, return its corresponding column number.
For example:
A -> 1
B -> 2
C -> 3
...
Z -> 26
AA -> 27
AB -> 28
进制转换，比兄弟题简单。
1 /** 2 * @param {string} s 3 * @return {number} 4 */ 5 var titleToNumber = function(s) { 6 var map = []; 7 var codeA = "A".charCodeAt(); 8 9 s = s.toUpperCase(); 10 var power = 0; 11 var result = 0; 12 for(var i = s.length - 1; i >= 0; i--, power++){ 13 var ch = s[i]; 14 result += ( ch.charCodeAt() - codeA + 1 ) * Math.pow(26, power); 15 } 16 17 return result; 18 };
[LeetCode][JavaScript]Excel Sheet Column Number
原文：http://www.cnblogs.com/Liok3187/p/4507967.html