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 () {
    let num=0;
    while(line = await readline()){
        let tokens = line.trim().toUpperCase().split('');
        let res=tokens.join(',').split(',')
        let info=await readline();
        res.map(item=>{
            if(item===info.trim().toUpperCase()){
                num+=1;
            }
            return num
        })
        console.log(num)
    }
}()