如何在字符串中间用前导零填充数字？

function padNumberWithZero(number, length) {
  let numberString = number.toString();
  let zeroCount = length - numberString.length;
  let paddedString = '';

  for (let i = 0; i < zeroCount; i++) {
    paddedString += '0';
  }

  paddedString += numberString;
  return paddedString;
}

// 示例用法
let number = 7;
let length = 5;
let paddedNumber = padNumberWithZero(number, length);
console.log(paddedNumber); // 输出：00007