菜鸟教程在线编辑器

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AI 编程工具
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>菜鸟教程(runoob.com)</title>
</head>
<body>
​
<p>文档添加 onmousemove 事件句柄，当在文档中移动鼠标时会显示随机数。</p>
<p>点击按钮移除事件句柄。</p>
<button onclick="removeHandler()">点我</button>
<p id="demo"></p>
<script>
document.addEventListener("mousemove", myFunction);
function myFunction() {
    document.getElementById("demo").innerHTML = Math.random();
}
function removeHandler() {
    document.removeEventListener("mousemove", myFunction);
}
</script>
​
</body>
</html>