<html><body><img src="klematis.jpg" alt="花" width="150" height="113"><img src="klematis2.jpg" alt="花" width="152" height="128"><img src="smiley.gif" alt="笑脸" width="42" height="42"><p>单击该按钮可显示文档中的图像数量。</p><button onclick="myFunction()">试一试</button><p id="demo"></p><script>function myFunction() { var x = document.images.length; document.getElementById("demo").innerHTML = x;}</script></body></html>