CSS樣式,圖片爲黑白色
filter樣式是調節圖片灰度;
li img{
transition: all linear .3s;
filter: grayscale(100%);
-webkit-filter: grayscale(100%);
}
鼠標懸停時,圖片爲原始色度(彩色)
li:hover img{
filter: grayscale(0);
-webkit-filter: grayscale(0);
filter: none;
}