题解 | #计算某字符出现次数#

const rl = require("readline").createInterface({ input: process.stdin });
var iter = rl[Symbol.asyncIterator]();
const readline = async () => (await iter.next()).value;

void async function () {
    // Write your code here
    let arr = [];
    while(line = await readline()){
        arr.push(line);
    }

    // 把字符串转换为小写
    let str = arr[0].toLowerCase();
    let c = arr[1].toLowerCase();


    let resNum = 0;
    for(let i = 0;i<str.length;i++){
        if(str[i] === c){
            resNum++;
        }
    }
    console.log(resNum)
}()