<!DOCTYPE html> <html> <body> <img id="img1" src="/static/demo/images/ct_htmltree.gif"> <img id="img2" src="/static/demo/images/dom_navigate.gif"> <p id="demo"></p> <script> document.getElementById("demo").innerHTML = "第一幅图片的 id 是:" + document.images[0].id; </script> </body> </html>