CSS3 greyscale 滤镜实现

.gray {

    -webkit-filter: grayscale(100%);

    -moz-filter: grayscale(100%);

    -ms-filter: grayscale(100%);

    -o-filter: grayscale(100%);

    filter: grayscale(100%);

    filter: gray;

}

<img src="mm1.jpg" />

<img src="mm1.jpg" class="gray" />