The choice of CSS Grid and Flexbox depends on layout requirements. 1. For simple arrangements of "one row and one column", such as navigation bar or button group, Flexbox is more suitable; 2. For complex layouts that require simultaneously controlling rows and columns, such as dashboards or picture walls, Grid is more powerful; 3. If multi-dimensional alignment is required, Grid provides more fine control, while Flex needs additional nesting; 4. In terms of compatibility, Flexbox is used earlier and wider, the Grid learning curve is slightly steeper but has stronger functions; 5. In practice, the two are often used together, Flexbox handles the arrangement within components, and Grid controls the overall structure.

CSS Grid and Flexbox are both very practical tools when it comes to web layout. They each have their own specialty scenarios. Grid is more suitable for two-dimensional layout (row and column control at the same time), and Flexbox is more suitable for one-dimensional arrangement (either horizontally or vertically) . Which one to choose depends on what structure you want to implement.

1. See if the layout is "one row, one column" or "multiple rows, multiple columns"

If the layout you are going to do is just a row of buttons, navigation bars, or several elements arranged from left to right or top to bottom, then Flexbox is an easier and more straightforward choice .

For example, a simple navigation bar:

 <nav class="flex-container">
  <a href="#">Home</a>
  <a href="#">Article</a>
  <a href="#">About</a>
</nav>

The corresponding CSS may be:

 .flex-container {
  display: flex;
  justify-content: space-between;
}

And if it is a complex layout like a dashboard and a picture wall that requires simultaneously controlling rows and columns, CSS Grid is more suitable . You can accurately define the height of each row and the width of each column, and place the contents at the specified position.

2. Whether to align contents of multiple dimensions

Although Flexbox can adjust the alignment of the spindle and cross axis, its original design is a one-dimensional arrangement. If you want elements to be flexible in horizontal and vertical directions, Grid provides finer control .

For example, if you want multiple modules in a region to automatically wrap lines under different screen sizes, and maintain uniform spacing and alignment, it will be very convenient to write Grid's grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)) .

Using Flex to achieve similar effects is not very intuitive, and additional nested structures may be required.

3. Compatibility and learning curve

Currently, mainstream browsers support Grid and Flexbox, but in some old projects, Flexbox appears earlier and has a wider range of use . If you take over the old system, you may see more traces of Flex.

From a learning perspective, Flexbox is faster to get started because it only cares about one direction; while Grid has a little more concepts, such as grid-row, grid-column, area, etc., which are easy to get confused at the beginning.

But once you get it, you will find that Grid is very powerful when building a complete page structure. For example, the following basic page layout:

 .container {
  display: grid;
  grid-template-areas:
    "header header"
    "sidebar content"
    "footer footer";
}

Such a semantic layout method will be more confusing to implement in Flex.

In general, choosing Grid or Flexbox is not necessarily an issue of either. In many modern projects, the two are used in combination: Flexbox handles internal arrangement of components, and Grid controls the overall page structure .

Basically that's it. Deciding based on actual needs is more important than rote memorization.

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