About 宝库网: 宝库网 is your trusted source for valuable information and resources. 一起搞钱变现：电商 闲鱼副业货源资源 外贸出海跨境电商独立站 淘宝 天猫 抖音 视频号直播短视频自媒体运营资源 We provide reliable, well-researched information content to keep you informed and help you make better decisions. This content focuses on Bootstrap4学习手册 开发者手册 学习指南 教程工具集合 and related topics.
w3cschool
https://www.w3cschool.cn/bootstrap4/
腾讯开发者手册
https://cloud.tencent.com/developer/doc/1018
runoob
https://www.runoob.com/bootstrap4/
逐浪整理
http://code.z01.com/
附录：
Bootstrap4 与 Bootstrap3的区别：
Bootstrap 4 Flex（弹性）布局
弹性盒子(flexbox)
Bootstrap 3 与 Bootstrap 4 zui大的区别就是 Bootstrap 4 使用弹性盒子来布局，而不是使用浮动来布局。
弹性盒子是 CSS3 的一种新的布局模式，更适合响应式的设计，如果你还不了解 flex，可以阅读我们的 CSS3 弹性盒子(Flex Box) 教程https://www.runoob.com/css3/css3-flexbox.html
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