www.jianshu.com/p/ea53c2daf…
Flex-grow defaults to 0 to “divide up” the “remaining space” of the parent item
Flex-shrink default 1 “absorbs” the excess space of the parent item by calculating the actual width *flex-shrink
Flex-basis defaults to auto weight > width
The default flex value is 0. 1 Auto
A value length or percentage is the flex-basis value
A non-negative value is the value of flex-grow
none: 0 0 auto
auto: 1 1 auto