设置文件全站置灰

$("body").css("-webkit-filter", "grayscale(100%)");

$("body").css("-moz-filter", "grayscale(100%)");

$("body").css("-ms-filter", "grayscale(100%)");

$("body").css("-o-filter", "grayscale(100%)");

$("body").css("filter", "progid:DXImageTransform.Microsoft.BasicImage(grayscale=1)");

$("body").css("_filter", "none");