reverse-integer_0709.html

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>reverse-integer</title>
  </head>
  <body></body>
  <script>
    /**
     * @param {number} x
     * @return {number}
     */
    var reverse = function (x) {
      let record = "";
      if (x < 0) {
        record = "-";
        x = Math.abs(x);
      }
      let num = Number((x + "").split("").reverse().join(""));
      if (!(num > Math.pow(-2, 31) && num < Math.pow(2, 31) - 1)) return 0;
      return record == "-" ? num * -1 : num;
    };
  </script>
</html>