leetcode1832.判断句子是否为全字母句

const check = (sentence) => {
    const res = (new Array(26)).fill(false);
    for(let i = 0;i<sentence.length; i++) {
        res[sentence[i].charCodeAt()-'a'.charCodeAt()] = true;
    }
    return res.some(n=>!!n);
}