题解 | #计算某字符出现次数#

const readline = require('readline');

const rl = readline.createInterface({
    input: process.stdin,
    output: process.stdout
});

const lines = [];

rl.on('line', function (line) {
    lines.push(line);
});

rl.on('close', () => {
    let total = 0;
    for (let i = 0; i < lines[0].length; i++) {
        if (lines[0][i].toLowerCase() === lines[1].toLowerCase()) {
            total++;
        }
    }
    console.log(total);
});