找出字符串里出现次数最多的字符

   let str = "dfghjkllkjhgfdfghhjkkjhgffghjklkjhgfdfghjkl"; 

  1. 统计各字符出现次数

 1 let obj = {};
 2 for (let i = 0; i < str.length; i++) {
 3   const item = str.charAt(i);
 4   if (obj[item]) {
 5     obj[item]++;
 6   } else {
 7     obj[item] = 1;
 8   }
 9 }
10 console.log(obj); //{ d: 3, f: 7, g: 7, h: 8, j: 7, k: 7, l: 4 }

  2. 找出最大出现次数的字符

1 let maxObj = { number: 1, name: "" };
2 for (let i in obj) {
3   if (obj[i] > maxObj.number) {
4     maxObj.number = obj[i];
5     maxObj.name = i;
6   }
7 }
8 console.log(maxObj); //{ number: 8, name: 'h' }

  String.charAt()接收一个索引,和Array[0]一样可以获取到某一项

posted @ 2023-02-01 16:32  january-yy  阅读(175)  评论(0)    收藏  举报