// 判斷一個字串中出現次數最多的字元，統計這個次數
    let str = 'aasdadddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddsdasjjhsghkafsagjkgfasgj;ksagj;lagsjlgjlsagjl;sajlk;gsasdadaaa';
    // 得到字元陣列
    let strArr = [...str];
    let obj = {};
    strArr.forEach((items, index) => {
      if (obj[items]) obj[items]++;
      else obj[items] = 1;
    });
    // 獲取物件的key陣列
    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 + '出現的次數是' + obj[max]);
 

轉載註明出處：https://blog.csdn.net/qq_36189935/article/details/83899403