.display_flex{
  display: -webkit-box;
  display: -ms-flexbox;
  display: -webkit-flex;
  display: flex;
}
/*伸缩流方向*/
.flex-direction_column{
  -webkit-box-orient: vertical;
  -ms-flex-direction: column;
  -webkit-flex-direction: column;
  flex-direction: column;
}
/*主轴对齐*/
.justify-content_flex-center{
  -webkit-box-pack: center;
  -ms-flex-pack: center;
  -webkit-justify-content: center;
  justify-content: center;
}
.justify-content_flex-end{
  -webkit-box-pack: end;
  -ms-flex-pack: end;
  -webkit-justify-content: flex-end;
  justify-content: flex-end;
}
.justify-content_flex-justify{
  -webkit-box-pack: justify;
  -ms-flex-pack: justify;
  -webkit-justify-content: space-between;
  justify-content: space-between;
}
/*侧轴对齐*/
.align-items_flex-start{
  -webkit-box-align: start;
  -ms-flex-align: start;
  -webkit-align-items: flex-start;
  align-items: flex-start;
}
.align-items_flex-end{
  -webkit-box-align: end;
  -ms-flex-align: end;
  -webkit-align-items: flex-end;
  align-items: flex-end;
}
.align-items_center{
  -webkit-box-align: center;
  -ms-flex-align: center;
  -webkit-align-items: center;
  align-items: center;
}
.align-items_baseline{
  -webkit-box-align: baseline;
  -ms-flex-align: baseline;
  -webkit-align-items: baseline;
  align-items: baseline;
}