Flexbox 適合一維佈局，Grid 適合二維佈局。要決定使用哪個工具，請根據(jù)以下要點判斷：1. 若只需沿行或列對齊元素（如導航欄、表單、列表卡片），則使用Flexbox，其特點包括間距控制（gap）、對齊方式（justify-content, align-items）以及自動伸縮項；2. 若需同時控制行和列的複雜結構（如頁面佈局、儀錶盤、圖片畫廊），則使用Grid，其支持定義行列（grid-template-columns/rows）、區(qū)域命名（grid-template-areas）及精確放置元素；3. 對於整體結構用Grid、局部對齊用Flexbox 的場景，兩者可結合使用，例如在Grid 佈局的單元格內(nèi)使用Flexbox 調(diào)整內(nèi)容排列。

Flexbox and Grid are both powerful layout tools in CSS, but they serve different purposes. Flexbox is best for one-dimensional layouts — like aligning items in a row or column. Grid shines when you need two-dimensional layouts — arranging items in rows and columns.

Here's how to decide which one to use based on your layout needs.

Use Flexbox for One-Dimensional Layouts

Flexbox was built with alignment in mind. It works well when you want to line things up either horizontally or vertically, without worrying too much about vertical and horizontal structure at the same time.

• Common use cases : Navigation bars, form elements, cards in a list, footer links.
• Key features :
  • Easy spacing between items ( gap )
  • Alignment control ( justify-content , align-items )
  • Items can grow or shrink to fill space

For example, if you're building a navbar where all the links should sit in a row and be evenly spaced, Flexbox does this easily:

 .navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

You don't have to worry about rows and columns — just how things line up in one direction.

Use Grid for Two-Dimensional Layouts

CSS Grid gives you more control over both rows and columns at the same time. If your design requires precise placement of items in a grid-like structure (like a dashboard or magazine layout), Grid is the way to go.

• Common use cases : Page layouts, image galleries, dashboards, responsive grids
• Key features :
  • Define explicit rows and columns
  • Place items precisely using grid lines or named areas
  • Control spacing with gap and grid-template-columns/rows

Say you're designing a homepage with a header, sidebar, main content, and footer — Grid makes it easy to define those areas clearly:

 .layout {
  display: grid;
  grid-template-areas:
    "header header"
    "sidebar main"
    "footer footer";
}

This kind of structure would be possible with Flexbox, but it gets messy fast. Grid keeps everything organized.

When They Can Work Together

Sometimes, you don't have to pick just one. You can use Grid for the overall page structure and Flexbox inside individual grid cells for alignment.

For example:

• Use Grid to create a 3-column layout
• Inside each column, use Flexbox to center or space out content

This combo gives you the best of both worlds: structure from Grid, alignment from Flexbox.

In practice, here's how to choose:

• ? Need to line up items in a row or column? → Flexbox
• ? Need a full layout with rows and columns? → Grid
• ? Want clean alignment inside a grid area? → Combine them

Both tools are modern and widely supported. The key is matching the right tool to the job.

基本上就這些。

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