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源代码：
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<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>安科教程(www.ancii.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>
运行结果
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