使用Javascript在HTML表单中乘以2个输入

<form>
  <label for="num1">第一个数：</label>
  <input type="number" id="num1" name="num1" required>
  <br>
  <label for="num2">第二个数：</label>
  <input type="number" id="num2" name="num2" required>
  <br>
  <button type="button" onclick="multiply()">计算</button>
</form>

function multiply() {
  var num1 = document.getElementById("num1").value;
  var num2 = document.getElementById("num2").value;
  var result = num1 * num2;
  alert("结果：" + result);
}