W3School TIY
编辑您的代码：
<!DOCTYPE html> <html> <head> <style> img { opacity:0.4; filter:alpha(opacity=40); /* For IE8 and earlier */ } img:hover { opacity:1.0; filter:alpha(opacity=100); /* For IE8 and earlier */ } </style> </head> <body> <h1>图像透明度</h1> <img src="../i/tulip_peach_blossom_w_s.jpg" alt="Peach Blossom" /> <p><b>注释：</b>在 IE 中，必须添加 <!DOCTYPE>，这样才能将 :hover 选择器用于除了 <a> 之外的其它元素。</p> </body> </html>
查看结果: