css:
html{filter: grayscale(100%);-moz-filter: grayscale(100%);-o-filter: grayscale(100%);-webkit-filter: grayscale(1)}
或者
js:
var myDate = new Date();
if(myDate.getDate()+0 == 3){
$("html").css("filter","grayscale(100%)")
$("html").css("-moz-filter","grayscale(100%)")
$("html").css("-o-filter","grayscale(100%)")
$("html").css("-webkit-filter","grayscale(1)")
}
3号变灰白