代码示例:(标识:eg_js_dom_event_2)
<!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>
运行结果: