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<!DOCTYPE html> <html> <head> <style> img { -webkit-filter: grayscale(100%); /* Chrome, Safari, Opera */ filter: grayscale(100%); } </style> </head> <body> <p>将图像转换为灰度：</p> <img src="pineapple.jpg" alt="菠萝" width="300" height="300"> <p><strong>注意：</strong> Internet Explorer 不支持 filter 属性。</p> </body> </html>