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1. Flex Box Model
Flex Box Model is a new layout model introduced in CSS3, which endows sub elements with strong spatial distribution and alignment capabilities. When the display property of an element is set to flex or inline flex, a Flex container is created. The direct child elements inside the container become Flex items, which will follow the layout rules of the Flex box model. The main axis refers to the direction of the arrangement items, usually extending from the starting point to the ending point. The cross axis is perpendicular to the main axis and also has directionality. The use of Flex containers is simple. Simply set the display property of an element to flex or inline flex, and its direct child elements will automatically become Flex items. The attributes that can be applied on the container include flex-direction、flex-wrap、flex-flow、justify-content、align-items、align-content Wait, they respectively control the spindle direction, arrangement of items, alignment, etc. On Flex items, properties such as flex grow, flex shrink, flex basis, flex, order, and align self can be adjusted to accurately control the expansion, contraction, alignment, and other aspects of the item. The flex grow attribute defines the expansion rules of items in the main axis direction, and the value determines the proportion of remaining space allocated to the items; Flex shrink defines the contraction rule of the term, where the numerical value determines the contraction ratio of the term in the main axis direction; Flex basis is used to specify the basic spatial size of the item in the main axis direction; The flex attribute is a composite use of the above three attributes. The order attribute determines the visual order
2. Introduction to Flex
Programmers who are enthusiastic about backend development may have some shortcomings in front-end page layout, and previously relied heavily on the Bootstrap framework to quickly build pages.
. During my university years, I learned some basic layout techniques, including table layout, div+CSS layout, waterfall layout, and Holy Grail layout. Recently, when laying out pages in WeChat mini programs, I found that using position+float layout is cumbersome, so I started to delve into learning flex layout. Flex layout, proposed by W3C in 2009, is widely used in mobile and mini program page layout due to its simplicity, completeness, and responsiveness. PC layout is also increasingly adopting this approach, becoming the mainstream layout solution. The core of Flex layout lies in its simplification of page layout, allowing developers to more flexibly control the arrangement of elements and space allocation. One of the most critical issues in front-end page layout is browser compatibility, and Flex layout performs outstandingly in this regard, supported by almost all mainstream browsers, with almost no version compatibility issues. The Flex layout model includes two important elements: flex container and flex item. When an el
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