<ol id="myOl">

    <li>Coffee</li>

    <li>Tea</li>

    <li>Milk</li>

    <li>Juice</li>

    <li>Water</li>

</ol>

<p>点击按钮检测列表是否为倒序的</p>

<p id="demo"></p>

<button onclick="myFunction()">尝试一下</button>

<script>

function myFunction(){

    var x = document.getElementById("myOl").reversed;

    document.getElementById("demo").innerHTML=x;

}

</script>

​