<div class=‘pageOption‘> <a href=‘#‘ class=‘option‘ > <img src=‘http://imgsrc.hubblesite.org/hu/db/images/hs-2013-06-a-large_web.jpg‘> </a> <a href=‘#‘ class=‘option‘ > <img src=‘http://imgsrc.hubblesite.org/hu/db/images/hs-2009-28-b-large_web.jpg‘> </a></div> 

body { background: gainsboro; }.pageOption { overflow: hidden; position: relative; margin: 0 auto; width: 40em; height: 27em;}.option, .option img { width: 100%; height: 100%; }.option { overflow: hidden; position: absolute; /* arctan(27 / 40) = 34.01935deg * need to skew by 90deg - 34.01935deg = 55.98065deg */ transform: skewX(-55.98deg);}.option:first-child { left: -.25em; transform-origin: 100% 0;}.option:last-child { right: -.25em; transform-origin: 0 100%;}.option img { opacity: .75; transition: .5s; }.option img:hover { opacity: 1; }.option img, .option:after { transform: skewX(55.98deg); transform-origin: inherit;}.option:after { position: absolute; margin: .5em 1.65em; color: white; font: 500 1.25em Courier; letter-spacing: .1em; text-transform: uppercase; content: attr(data-inf);}.option:first-child:after { top: 0; left: 0; }.option:last-child:after { right: 0; bottom: 0; }

效果：鼠标移入上下两块三角图片，产生交互效果