Js查找字符串中出现最多次数的字母和单词

 查询出现次数最多的字母

    let str = "abcdaaaabcd123486 hello word";
    let num = str.match(/[a-zA-Z]/g).length;
    let len = str.match(/[a-zA-Z]/g);
    let obj = {};
    for (let i = 0; i < len.length; i++) {
    let key = len[i];
    if (!obj[key]) {
        obj[key] = [1];
    } else {
        obj[key].push(1);
        }  
    }

    let max = 0, name;
    let all = [];
    for (let key in obj) {
    if (obj[key].length === max) {
        max = obj[key].length;
        all.push(key);
    } else if (obj[key].length > max) {
        max = obj[key].length;
        all = [];
        all[0] = key;
        }
    }
    console.log(`出现次数最多的字母为${all},出现了${obj[all[0]].length}次`);

查询出现次数最多的单词

    let article = " hello word hello come的喂 come的喂 come的喂";
    let newArticle = article.trim();
    let match = newArticle.match(/[a-zA-Z]+/ig);
    let wordLength, word, max = 0, maxWord = [];
    for (let i = 0; i < match.length; i++) {
    word = new RegExp("" + match[i] + "", 'g');
    wordLength = article.match(word).length;
    if (wordLength == max) {
        max = wordLength;
        maxWord.push(match[i]);
    } else if (wordLength > max) {
        max = wordLength;
        maxWord = [];
        maxWord[0] = match[i];
    }
    }
    maxWord = [...new Set([...maxWord])];
    console.log(`出现次数最多的单词是：${maxWord}。次数为：${max}`);