background:linear-gradient(to left,#fff,#000); 没有top

還是不對耶 background:-moz-linear-gradient(to left top,#fff,#000); background:-o-linear-gradient(to left top,#fff,#000); background:-webkit-linear-gradient(to left top,#fff,#000);

少了to了： background-image:linear-gradient(to left top,#fff,#999);