获取时间
<body>
<p id="demo">获取今年的年份。</p>
<button onclick="myFunction()">点击</button>
<script>
function myFunction(){
var d = new Date();
var x = document.getElementById("demo");
x.innerHTML=d.getFullYear();
}
</script>
</body>
<body>
<p id="demo">单击按钮显示毫秒数。</p>
<button onclick="myFunction()">...</button>
<script>
function myFunction(){
var d = new Date();
var x = document.getElementById("demo");
x.innerHTML=d.getTime();
}
</script>
</body>
<body>
<p id="demo">单击按钮显示修改后的年月日。</p>
<button onclick="myFunction()">按钮</button>
<script>
function myFunction(){
var d = new Date();
d.setFullYear(2020,10,3);
var x = document.getElementById("demo");
x.innerHTML=d;
}