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<!DOCTYPE html> <html> <body> <img src="klematis.jpg" alt="花" width="150" height="113"> <img src="klematis2.jpg" alt="花" width="152" height="128"> <img id="myImg" src="smiley.gif" alt="笑脸" width="42" height="42"> <p>单击该按钮可为文档中的第一张图像添加黑色虚线边框。</p> <button onclick="myFunction()">试一试</button> <p id="demo"></p> <script> function myFunction() { var x = document.images[0]; x.style.border = "10px dotted black"; } </script> </body> </html>