Flexbox適合一維布局，Grid適合二維布局。Flexbox用于排列單行或單列的項目，如導航欄、按鈕對齊、卡片布局；支持自動調整大小并簡化空間分配。CSS Grid適用于復雜布局，如網(wǎng)頁整體結構、儀表盤、雜志風格設計；支持定義行列尺寸、精確放置元素，并可命名區(qū)域。兩者可結合使用：Grid處理整體結構，F(xiàn)lexbox處理內部對齊。選擇依據(jù)是布局維度需求。

If you're trying to build layouts on the web and keep hearing about CSS Grid and Flexbox, you’re probably wondering which one to use and how they’re different. The short version is this: Flexbox is best for arranging items in a single row or column, while Grid is designed for two-dimensional layouts—both rows and columns at the same time. That’s the core difference.

Let’s break it down into practical terms so you can decide when to use each.

When to Use Flexbox

Flexbox shines when you want to line things up horizontally or vertically and have them behave nicely across different screen sizes. It’s great for things like navigation bars, form elements, or any layout that flows in one direction.

Here are some typical situations where Flexbox makes sense:

• You need to space out a few buttons evenly.
• You want to align text and icons inside a header or footer.
• You’re building a card layout that only needs to handle content in a row or column.

One of the most useful features of Flexbox is its ability to adjust item sizes based on available space. For example, if you set display: flex on a container and give all child elements flex: 1, they’ll stretch equally to fill the space—no math needed.

You don’t need to worry too much about rows and columns with Flexbox. It’s more about flow than structure.

Why Choose CSS Grid?

CSS Grid steps in when your layout gets more complex and needs both rows and columns to work together. Think of full-page layouts, magazine-style designs, or dashboards with widgets arranged in a grid pattern.

With Grid, you can define exact column and row sizes, create gaps between items, and even place elements precisely where you want them using line numbers or named areas.

For example:

• You can create a layout with a sidebar, main content area, and footer without relying on extra wrappers.
• You can define responsive behavior by changing the grid template at different breakpoints.

A key benefit of Grid is control. If you want three columns that are 1fr, 2fr, and 1fr wide, and then two rows that auto-size based on content, you can do that easily with:

grid-template-columns: 1fr 2fr 1fr;
grid-template-rows: auto auto;

It's also possible to name areas in your layout like this:

grid-template-areas:
  "header header"
  "sidebar main"
  "footer footer";

Then assign each element to one of those areas using grid-area: header;.

How They Work Together

Don’t feel like you have to pick one or the other exclusively. In many real-world projects, you’ll use both Flexbox and Grid depending on what part of the layout you're working on.

For instance:

• Use Grid for the overall page structure (like header, sidebar, main content, footer).
• Use Flexbox inside smaller components (like buttons, cards, or form fields) to align items neatly.

This combo gives you the best of both worlds: powerful layout control from Grid and flexible alignment from Flexbox.

Also, remember that both are responsive-friendly. You can combine them with media queries or even newer tools like container queries to build adaptive interfaces.

Final Thoughts

So, is it Grid vs Flexbox? Not really—it’s more about choosing the right tool for the job.
Use Flexbox when you're dealing with one-dimensional layouts.
Switch to Grid when you need true two-dimensional control.

They’re both solid tools, and knowing when to reach for each will make your life easier.
基本上就這些。

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