*{ margin:0px; padding:0px;}
body 
{
    line-height:1.5;
    font-family:微软雅黑;
}
a{ text-decoration:none;}
ul,li{ list-style:none; }


.nav
{
    background: #000000;
    width: 100%;
    left: 0;
    position: relative;
    z-index: 99;
}
.nav ul
{
    overflow: hidden;
    width: 1200px;
    margin: 0 auto;
}
.nav li
{
    position: relative;
    line-height: 60px;
    float: left;
    width: 15%;
    text-align: center;
    font-size: 16px;
}
.nav li a
{
    color: #fff;
}

.nav.topFix{ position:fixed; left:0; top:0;}