css3布局属性flex

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.ul_box{
    margin:0;
    padding: 0;
    list-style: none;
    /*display: flex将对象作为弹性伸缩盒显示;
    flex-flow:flex-direction(确定弹性子元素排列方式)和
              flex-wrap(当弹性子元素超出弹性元素容器范围时是否换行)的复合属性,
    写入父容器里;    */
    display: flex;
    flex-flow: row wrap;
}
.ul_box li{
    text-align: center;
    height:40px;
    line-height: 40px;
    /*flex:flex-grow(设置弹性子元素的扩展比率)
     *        flex-shrink(设置弹性子元素的收缩比率)
     *        flex-basis(指定弹性子元素伸缩前的默认大小值，相当于width和height属性。)
     * 这三种属性的复合属性，写入子容器里;*/
    flex: 1 1 100%;
}
.ul_box li a{
    text-decoration: none;
    color:#fff;
}
.ul_box li:nth-child(1){
    background: #008000;
}
.ul_box li:nth-child(2){
    background: #4169E1;
}
.ul_box li:nth-child(3){
    background: #8A2BE2;
}
.ul_box li:nth-child(4){
    background: #A52A2A;
}
.ul_box li:nth-child(5){
    background: #FFA500;
}
.ul_box li:nth-child(6){
    background:#9ACD32;
}
@media (min-width:480px ) {
    .ul_box li{
        flex: 1 1 50%;
    }
}
@media (min-width:768px ) {
    .ul_box{
        flex-flow: row nowrap;
    }
}