代码示例:(标识:jsck_getdate_2)
<!DOCTYPE html>
<html>
<body>

<p>单击该按钮可显示特定日期的月份中的某一天。</p>

<button onclick="myFunction()">试一试</button>

<p id="demo"></p>

<script>
function myFunction() {
  var d = new Date("July 21, 1983 01:15:00");
  var n = d.getDate()
  document.getElementById("demo").innerHTML = n;
}
</script>

</body>
</html>
运行结果: