js求1-10000的对称数

function isPalindrome(num) {
  var str = num.toString();
  var len = str.length;
  for (var i = 0; i < Math.floor(len / 2); i++) {
    if (str[i] !== str[len - 1 - i]) {
      return false;
    }
  }
  return true;
}
function findSymmetricNumbers() {
  var symmetricNumbers = [];
  for (var i = 1; i <= 10000; i++) {
    if (isPalindrome(i)) {
      symmetricNumbers.push(i);
    }
  }
  return symmetricNumbers;
}
var symmetricNums = findSymmetricNumbers();
console.log(symmetricNums);