.father{
display: flex;
flex-flow: row nowrap;
.son1{
width: 20px;
}
.son2{
flex-grow: 1;
}
}占满宽度，flex-direction: row;
占满高度，flex-direction: column;
最后一个元素flex-frow: 1;
THE END
MSNC.CN
.father{
display: flex;
flex-flow: row nowrap;
.son1{
width: 20px;
}
.son2{
flex-grow: 1;
}
}占满宽度，flex-direction: row;
占满高度，flex-direction: column;
最后一个元素flex-frow: 1;