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grayscale(amount) : 对图片进行灰度转换。
amount转换值的大小，可以是数字或百分比。
当值为 100% 时，灰度最大。
0% 时与原图没有区别。
0% 到 100% 之间的值会使灰度线性变化。
amount 为空时使用值为1。
CSS代码，任选一种方式
filter: grayscale(100%); filter: grayscale(1);
为了方便，可以在后台这样加入
<style type="text/css"> html { filter: grayscale(100%); } </style>
适配多种浏览器
-webkit-filter: grayscale(100%); -moz-filter: grayscale(100%); -ms-filter:
grayscale(100%); -o-filter: grayscale(100%); filter: grayscale(100%);
还有一些其他的效果
/*blur 模糊*/ filter:blur(2px); /*brightness 亮度*/ filter:brightness(25%);
/*contrast 对比度*/ filter: contrast(50%); /*drop-shadow 阴影*/ filter: drop-shadow(
5px 5px 5pxrgba(0, 0, 0, 0.5)); /*opacity 透明度*/ filter: opacity(50%);
/*grayscale 灰度*/ filter: grayscale(80%); /*sepia 褐色*/ filter: sepia(100%);
/*invert 反色*/ filter: invert(100%); /*hue-rotate 色相旋转*/ filter:hue-rotate(180deg
); /*saturate 饱和度*/ filter: saturate(1000%);
