css3背景渐变兼容性

            background: -webkit-gradient(linear, 0 0, 0 100%, from(#eee), to(#aaa)); /** Chrome Safari **/
            background: -moz-linear-gradient(top, #eee, #aaa); /** FireFox **/
            background: -o-linear-gradient(top, #eee, #aaa);/** Opear **/
            background: -ms-linear-gradient(#eeeeee 0%,#aaaaaa 100%);/** IE9 IE10 **/
            filter:progid:DXImageTransform.Microsoft.gradient(startColorstr=‘#eeeeee‘,endColorstr=‘#aaaaaa‘,grandientType=1); /** IE7 **/
            -ms-filter: progid:DXImageTransform.Microsoft.gradient(startColorstr=‘#eeeeee‘,endColorstr=‘#aaaaaa‘,grandientType=1); /** IE8 **/ }