<p id="demo">单击按钮显示给定时间的毫秒数：</p>

<button onclick="myFunction()">点我</button>

<script>

function myFunction(){

    var d = new Date("July 21, 1983 01:15:00:526");

    var x = document.getElementById("demo");

    x.innerHTML=d.getMilliseconds();

}

</script>

​