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<!DOCTYPE html>
<html>
<body>
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<h1>Document 对象</h1>
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<h2>removeEventListener() 方法</h2>
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<p>每当您在本文档中移动鼠标时，mousemove 事件处理程序都会显示一个随机数。</p>
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<p>单击“移除”可删除事件处理程序。</p>
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<button onclick="removeHandler()">移除</button>
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<p id="demo"></p>
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<script>
document.addEventListener("mousemove", myFunction);
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function myFunction() {
  document.getElementById("demo").innerHTML = Math.random();
}
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function removeHandler() {
  document.removeEventListener("mousemove", myFunction);
}
</script>
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</body>
</html>
​