点击按钮显示时间日期
...
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
<p id="demo">这是一个段落</p>
<button type="button" onclick="displayDate()">显示日期</button>
</body>
</html>
<script>
function displayDate(){
document.getElementById("demo").innerHTML=Date();
}
</script>
...
