CSS代码:
.gray { 
    -webkit-filter: grayscale(100%);
    -moz-filter: grayscale(100%);
    -ms-filter: grayscale(100%);
    -o-filter: grayscale(100%);
	
    filter: grayscale(100%);
    filter: url(gray.svg#grayscale);
	
    filter: gray;
}
HTML代码:
<img src="http://image.zhangxinxu.com/image/study/s/s256/mm1.jpg" />
<img src="http://image.zhangxinxu.com/image/study/s/s256/mm1.jpg" class="gray" />
SVG代码:
<svg version="1.1" xmlns="http://www.w3.org/2000/svg">
    <filter id="grayscale">
        <feColorMatrix type="matrix" values="0.3333 0.3333 0.3333 0 0 0.3333 0.3333 0.3333 0 0 0.3333 0.3333 0.3333 0 0 0 0 0 1 0"/>
    </filter>
</svg>

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