如果您知道有多少张图片，可以使用CSS3轻松完成。
#crossfade > img { width: 100%; height: 100%; position: absolute; top: 0px; left: 0px; color: transparent; opacity: 0; z-index: 0; -webkit-backface-visibility: hidden; -webkit-animation: imageAnimation 30s linear infinite 0s; -moz-animation: imageAnimation 30s linear infinite 0s; -o-animation: imageAnimation 30s linear infinite 0s; -ms-animation: imageAnimation 30s linear infinite 0s; animation: imageAnimation 30s linear infinite 0s; }“ -webkit-animation：imageAnimation 30s 线性 无限 0s; ”处的“ 30s”
表明，每个图像的动画将无限次持续30秒。
#crossfade > img:nth-child(2) { background-image: url(../images/2.jpg); -webkit-animation-delay: 6s; -moz-animation-delay: 6s; -o-animation-delay: 6s; -ms-animation-delay: 6s; animation-delay: 6s; }#crossfade > img:nth-child(3) { background-image: url(../images/3.jpg); -webkit-animation-delay: 12s; -moz-animation-delay: 12s; -o-animation-delay: 12s; -ms-animation-delay: 12s; animation-delay: 12s; }#crossfade > img:nth-child(4) { background-image: url(../images/4.jpg); -webkit-animation-delay: 18s; -moz-animation-delay: 18s; -o-animation-delay: 18s; -ms-animation-delay: 18s; animation-delay: 18s; }#crossfade > img:nth-child(5) { background-image: url(../images/5.jpg); -webkit-animation-delay: 24s; -moz-animation-delay: 24s; -o-animation-delay: 24s; -ms-animation-delay: 24s; animation-delay: 24s; }@-webkit-keyframes imageAnimation { 0% { opacity: 0; -webkit-animation-timing-function: ease-in; } 8% { opacity: 1; -webkit-animation-timing-function: ease-out; } 17% { opacity: 1 } 25% { opacity: 0 } 100% { opacity: 0 }}@-moz-keyframes imageAnimation { 0% { opacity: 0; -moz-animation-timing-function: ease-in; } 8% { opacity: 1; -moz-animation-timing-function: ease-out; } 17% { opacity: 1 } 25% { opacity: 0 } 100% { opacity: 0 }}@-o-keyframes imageAnimation { 0% { opacity: 0; -o-animation-timing-function: ease-in; } 8% { opacity: 1; -o-animation-timing-function: ease-out; } 17% { opacity: 1 } 25% { opacity: 0 } 100% { opacity: 0 }}@-ms-keyframes imageAnimation { 0% { opacity: 0; -ms-animation-timing-function: ease-in; } 8% { opacity: 1; -ms-animation-timing-function: ease-out; } 17% { opacity: 1 } 25% { opacity: 0 } 100% { opacity: 0 }}@keyframes imageAnimation { 0% { opacity: 0; animation-timing-function: ease-in; } 8% { opacity: 1; animation-timing-function: ease-out; } 17% { opacity: 1 } 25% { opacity: 0 } 100% { opacity: 0 }}
