题解 | #字符逆序#

const readline = require('readline')
const r1 = readline.createInterface({
  input: process.stdin,
  output: process.stdout,
})
r1.on('line', function (line) {
//   方法一，利用冒泡排序
  var arr = line.split('')
  for (let i = 0; i < arr.length - 1; i++) {
    for (let j = 0; j < arr.length - i - 1; j++) {
      var temp = arr[j]
      arr[j] = arr[j + 1]
      arr[j + 1] = temp
    }
  }

  var m = ''
  for (let i in arr) {
    m = m + arr[i]
  }
  console.log(m)
  // 方法二，
  // reverse():将数组颠倒；join(''):转换为字符串
  // console.log(line.split('').reverse().join(''))
})