leetcode刷题记录——242有效字母异位词

代码：

var isAnagram = function(s, t) {
    // return s.split('').sort().join('') === t.split('').sort().join('')

    let getObj = function(str) {
        let res = {}
        for (let i = 0; i < str.length; i++) {
            let v = str.charCodeAt(i);
            if (res[v]) {
                res[v]++;
            } else {
                res[v] = 1;
            }
        }
        return res;
    }
    let sObj = getObj(s);
    let tObj = getObj(t);
    let sKeys = Object.keys(sObj);
    let tKeys = Object.keys(tObj);
    if (sKeys.length !== tKeys.length) {
        return false;
    } else {
        for (let i = 0; i < sKeys.length; i++) {
            let v = sKeys[i];
            if (!tObj[v] || tObj[v] !== sObj[v]) {
                return false;
            }
        }
        return true;
    }
};