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.nav li{display:block;vertical-align: middle;-webkit-transform: translateZ(0);transform: translateZ(0);box-shadow: 0 0 1px rgba(0, 0, 0, 0);-webkit-backface-visibility: hidden;backface-visibility: hidden;-moz-osx-font-smoothing: grayscale;position: relative; background: url(../images/nav-bg.jpg) no-repeat center right;-webkit-transition-property: color;transition-property: color;-webkit-transition-duration: 0.3s;transition-duration: 0.3s;
}
.nav li:before {content: "";position: absolute;z-index: -1;top: 0;bottom: 0;left: 0;right: 0;background:#14a9f0;-webkit-transform: scaleX(0);transform: scaleX(0);-webkit-transform-origin: 50%;transform-origin: 50%;-webkit-transition-property: transform;transition-property: transform;-webkit-transition-duration: 0.3s;transition-duration: 0.3s;-webkit-transition-timing-function: ease-out;transition-timing-function: ease-out;
}

必須得寫全，告訴瀏覽器需要這樣去執(zhí)行，這樣就實(shí)現(xiàn)背景色的過(guò)渡了

演示地址：http://www.ok3333.net/d/demo/beijingseguodu/