ie9背景渐变兼容

渐变是css3得属性，所以在版本低的ie浏览器中是不显示得，修改的方法如下，已测试

background: linear-gradient(to right, #0084ff, #03A9F4);

background: -moz-linear-gradient(to right, #0084ff, #03A9F4);

background: -ms-linear-gradient(to right, #0084ff, #03A9F4);

background: -o-linear-gradient(to right, #0084ff, #03A9F4);

background: linear-gradient(to right, #0084ff, #03A9F4);

filter: progid:DXImageTransform.Microsoft.Gradient(startColorStr='#0084ff',endColorStr='#03A9F4',gradientType='0');

-ms-filter: "progid:DXImageTransform.Microsoft.Gradient(startColorStr='#0084ff',endColorStr='#03A9F4',gradientType='0')";