/*弹性布局*/
.flex{
    display:-webkit-box;
    display: -moz-box;
    display: -ms-flexbox;
    display: -webkit-flex;
    display: flex;
}
.flex-v{
    -webkit-box-orient:vertical;
    -webkit-flex-direction:column;
    -ms-flex-direction:column;
    flex-direction:column;
}
.flex-item{
    -webkit-box-flex: 1;
    -webkit-flex: 1;
    -ms-flex: 1;
    flex: 1;
}
.flex-wrap{
    -webkit-box-flex-wrap: wrap;
    -webkit-flex-wrap: wrap;
    -ms-flex-wrap:wrap;
    flex-wrap: wrap;
}
.flex-align-center {
    -webkit-box-align: center;
    -webkit-align-items: center;
    -ms-flex-align: center;
    align-items: center;
}
.flex-pack-center {
    -webkit-box-pack: center;
    -webkit-justify-content: center;
    -ms-flex-pack: center;
    justify-content: center;
}
.flex-pack-justify {
    -webkit-box-pack: justify;
    -webkit-justify-content: space-between;
    -ms-flex-pack: justify;
    justify-content: space-between;
}
.flex-end{
    -webkit-box-pack: end;
    -ms-flex-pack: end;
    -webkit-justify-content: flex-end;
    justify-content: flex-end;
}