.gif-1 {
            display: block;
            width: 150px;
            height: 220px;
            background: url(images/animation/ku_animation.png) 0 0 no-repeat;
            background-size: 100%;
            animation: ku 0.4s steps(14) infinite
        }

        @keyframes ku {
            from {
                background-position: 0 0;
            }
            to {
                background-position: 0 -3080px;
            }
        }

假设图片为150*3300，为15帧，每帧为150*220则

1. background-position: 0 -3080px;    -3080为长图height-一帧的高度，即3300-220=3080

2. animation: ku 0.4s steps(14) infinite     0.4s内完成整个懂的年华，steps为15帧-1=14