简单思路：
下面是正则表达式的方法
1
2
3
4
5
6
7
8
9
10
/**
* @param {string} s
* @return {number}
*/
var lengthOfLastWord = function (s) {
const list = s.replace(/^\s+|\s+$/g, "").split(" ");
return list[list.length - 1].length;
};
console.log(lengthOfLastWord("Hello World "));
下面是字符串遍历判断
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
/**
* @param {string} s
* @return {number}
*/
var lengthOfLastWord = function (s) {
let count = 0;
let flag = false;
for (let i = s.length - 1; i >= 0; i--) {
const c = s[i];
if (c !== " ") flag = true;
if (flag && c === " ") break;
if (flag) {
count += 1;
}
}
return count;
};
console.log(lengthOfLastWord("Hello World "));
