<html><body><h1>Document 对象</h1><h2>images 属性</h2><img src="/i/photo/tulip.jpg" alt="flower" width="180" height="180"><img src="/i/photo/tulip-2.jpg" alt="flower" width="180" height="180"><img src="/i/photo/flower.gif" alt="flower" width="180" height="180"><p>图片数量为：</p><p id="demo"></p><script>let numb = document.images.length;document.getElementById("demo").innerHTML = numb;</script></body></html>