<html><body><h1>HTML DOM Attributes</h1><h2>length 属性</h2><img id="myImg" alt="Flower" src="/i/photo/tulip.jpg" width="300" height="300"><p>图片的属性数是：</p><p id="demo"></p><script>let num = document.getElementById("myImg").attributes.length;document.getElementById("demo").innerHTML = num;</script></body></html>