5. 完整代码 http://ruyo-net-demo.qiniudn.com/Bootstrap_left_menu.html
5. 完整代码 http://ruyo-net-demo.qiniudn.com/Bootstrap_left_menu.html
<blockquote class="card-blockquote"> It's really good news that the new Bootstrap 4 now has support for CSS 3 flexbox. Makes flexible layouts Faster </blockquote>
body scroll, and placement. Offcanvas components can be placed on the top, right, bottom, or left of the viewport. Configure these options withdataattributes or via the JavaScript APIs.
class="card col-12 col-md-4" style="width: 18rem; border-width: 0;"> Card title Some quick example text to build on the card title and make up the bulk of the card's content. Go somewhere
Image cap Featured Card title Some quick example text to build on the card title and make up the bulk of the card's content. Go somewhere Card title This is a wider card with supporting text below as a natural lead-in to additional content. This content is a little bit longer. ...
.item{float:left,width:300px;/*或者 width: 33%*/} 其实不用关心每一份的宽度是多少像素/百分比,只关心能不能自动地平均划分成多少份,也就是说页面的划分是否是成比例的, Bootstrap 的栅格系统布局就是为了实现自动计算每一份的宽度而诞生的。栅格可以理解为一个安全门,它的总长度可以拉长,可以缩短,但是总...
class="card-link btn btn-outline-success rounded-pill text-success">注册 第4步:设计自定义样式,使页面更加美观。 @media (max-width: 992px){/*在小屏设备中,设置外边距,上下边距为1rem,左右为0*/.left{ margin:1rem 0; }} @media(min-width: 992...
card-heading card-image card-list card-text caret-down caret-down-fill caret-down-square caret-down-square-fill caret-left caret-left-fill caret-left-square caret-left-square-fill caret-right caret-right-fill caret-right-square caret-right-square-fill caret-up caret-...
The default value for thefallbackPlacementsis changed to['top', 'right', 'bottom', 'left']for better placement of Popper elements.Applies to dropdowns, popovers, and tooltips. Removed underscore from public static methods like_getInstance()→getInstance()....