题解 | 字符串反转

const readline = require('readline');

const rl = readline.createInterface({
    input: process.stdin,
    output: process.stdout
});
rl.on('line', function (line) {
    let index = 0
    let length = line.length
    let arr = []
    while(index < length) {
        let swapIndex = length - 1 - index
        arr[swapIndex] = line[index]
        index++
    }
    console.log(arr.join(''))
});