(ES6的“...“配合ES5‘’forEach‘’)前端面试之判断一个字符串中出现次数最多的字符，统计这个次数

    // 判断一个字符串中出现次数最多的字符，统计这个次数
    let str = 'aasdadddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddsdasjjhsghkafsagjkgfasgj;ksagj;lagsjlgjlsagjl;sajlk;gsasdadaaa';
    // 得到字符数组
    let strArr = [...str];
    let obj = {};
    strArr.forEach((items, index) => {
      if (obj[items]) obj[items]++;
      else obj[items] = 1;
    });
    // 获取对象的key数组
    let keyArr = Object.keys(obj)
    let max = null
    keyArr.forEach((items, index) => {
      if (index === 0) max = items
      else if (obj[max] < obj[items]) max = items
    })
    console.log(obj);
    console.log(max + '出现的次数是' + obj[max]);

转载注明出处：https://blog.csdn.net/qq_36189935/article/details/83899403