/*清楚内外边距*/
body, div, dl, dt, dd, ul, img, ol, li, h1, h2, h3, h4, h5, h6, pre, form, fieldset, input, textarea, p, blockquote, th, td {
    padding: 0;
    margin: 0
}
/*设置body和html*/
body,html{
    width: 100%;
    height: 100%;
}
/*去除a标签底部样式*/
a{
    text-decoration: none;
}
/*去除li标签默认点样式*/
li{
    list-style: none;
}
/*标签隐藏*/
.disnone{
    display: none;
}
/*标签显示*/
.disblock{
    display: block;
}
/*清楚浮动*/
.clear{
    clear: both;
}
.fix::after {
    content:".";
    display:block;
    height:0;
    visibility:hidden;
    clear:both;
}