<html>
<body>
日期: <input type="datetime" id="myDatetime">
<p>点击按钮设置 datetime 字段的日期和时间。</p>
<button onclick="myFunction()">点我</button>
<p id="demo"></p>
<script>
function myFunction() {
document.getElementById("myDatetime").value = "2014-01-02T11:42Z";
}
</script>
</body>
</html>