1.display:flex
让最后一个不受控制的话可以用margin-left,margin-left:auto这是向右浮动
2.清楚浮动
.clearfix:after{
display: block;
clear: both;
content: "";
visibility: hidden;
height: 0;
}
.clearfix{
zoom:1;
}
3.做一个全局的请求