知识点记录:
1.flex-flow属性用于设置灵活项目的布局方式,是 flex-direction 和 flex-wrap的复合属性,书写格式 flex-flow:direction wrap
flex-direction属性值:
flex-flow:row,伸缩项目在flexbox中 由左向右水平排列,row-reverse为相反方向
flex-flow:column,伸缩项目在flexbox中 由上向下垂直排列。column-reverse为相反方向
flex-wrap属性值:
nowrap,灵活项目不拆行或拆列
wrap,灵活项目在必要的时候拆行或拆列
wrap-reverse,灵活项目必要时候按照相反顺序拆行或拆列
2.设置元素水平垂直居中
一种情况,元素有明确的高度
① 绝对定位+ 负margin,元素属性值设置:position: absolute;left:50%;top:50%;margin-left: -w/2(元素宽度一半);margin-top: -h/2(元素高度一半);
② 仅适用绝对定位,元素属性值设置:position: absolute;top: 0;right: 0;bottom: 0;left: 0;margin: auto;
二种情况,元素没有确定的高度
① 绝对定位+ transform,元素属性值设置:position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);
② 模拟 table布局,父元素属性设置:display:table;,子元素属性设置:display:table-cell;text-align:center;vertical-align:middle;,table在布局方面通常不推荐使用
③ 使用伪元素创建居中内容
3.弹性盒子的宽度通常使用百分比进行设置,不设置固定高度,由内容填充后自动撑开,元素内灵活项目默认水平排列
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