html运行实例（event_mouse_ctrlkey）-搜寻教程库

代码示例：（标识：event_mouse_ctrlkey）

<!DOCTYPE html>
<html>
<body onmousedown="isKeyPressed(event)">

<p>单击文档中的某处。当 onmousedown 事件发生时，警告框会提示您 CTRL 键是否被按下。</p>

<p><b>提示：</b>请在单击文档之前尝试按住 CTRL 键（在您的键盘上）。</p>

<script>
function isKeyPressed(event) {
  if (event.ctrlKey) {
    alert("The CTRL key was pressed!");
  } else {
    alert("The CTRL key was NOT pressed!");
  }
}
</script>

</body>
</html>