js求取小数点后100位小数，判断是否可除尽

function getDecimal(a, b) {
  let list = [];
  let remainder = a % b; // 求取当前余数

  while (list.length < 100) {
    let remainder2 = Math.floor(remainder * 10 / b);
    list.push(remainder2);
    remainder = remainder * 10 % b; // 求取下一位余数
  }

  return list.join(‘‘);
}

function isDivisible(a, b) {
  let list = [];
  let isDivide = [];
  let flag = true;
  let result = true;
  let remainder = a % b;

  while (flag) {
    let remainder2 = Math.floor(remainder * 10 / b);
    if (remainder === 0) {
      // 能除尽
      flag = false;
    } else if (isDivide.includes(remainder)) {
      // 不能除尽
      flag = false;
      result = false;
    } else {
      isDivide.push(remainder);
    }
    list.push(remainder2);
    remainder = remainder * 10 % b;
  }

  // 返回结果和余数
  return [result, list];
}