​x
 
<!DOCTYPE html>
<html>
<body>
​
<p>请点击“试一试”按钮，以执行 displayDate() 函数。</p>
​
<button id="myBtn">试一试</button>
​
<p id="demo"></p>
​
<script>
document.getElementById("myBtn").onclick = displayDate;
​
function displayDate() {
  document.getElementById("demo").innerHTML = Date();
}
</script>
​
</body>
</html> 
​