CSS中常用的顏色表示方法有三種：HEX、RGB和HSL。 1. HEX使用六位十六進(jìn)制數(shù)表示顏色，以#開(kāi)頭，如#FF5733，適用於精確配色且易於復(fù)制；2. RGB通過(guò)紅綠藍(lán)三色值控制顏色，如rgb(255, 87, 51)，適合動(dòng)態(tài)顏色調(diào)整併支持透明度設(shè)置；3. HSL基於色相、飽和度和亮度定義顏色，如hsl(20, 100%, 60%)，便於調(diào)整色調(diào)和創(chuàng)建一致的配色方案。每種格式各有優(yōu)勢(shì)，選擇取決於具體需求與使用場(chǎng)景。

When working with colors in CSS, you've got a few solid options to choose from — and each has its own strengths depending on what you're trying to do. The three most common methods are HEX, RGB, and HSL. Let's break them down so you know when and why you might use each one.

HEX color codes – simple and widely used

HEX is probably the most familiar format if you've worked with web design or picked colors using tools like Photoshop or Figma. It uses a six-digit hexadecimal number to represent a color.

• Starts with a # symbol
• Followed by 6 characters (0–9 and A–F)
• Example: #FF5733

Each pair of characters represents red, green, and blue values respectively. So FF is the max value for red, 57 for green, and 33 for blue.

Why use HEX?

• Compact and easy to copy/paste
• Supported everywhere
• Great for exact color matching

One thing to note: it's not super intuitive for tweaking shades or adjusting brightness unless you're already comfortable reading hex values.

RGB – direct control over red, green, and blue

RGB stands for Red, Green, Blue, and in CSS you specify each component as a value between 0 and 255.

• Uses the rgb() function
• Example: rgb(255, 87, 51)

You can also use percentages instead of numbers:

• Like this: rgb(100%, 34%, 20%)

Why go with RGB?

• Easier to understand than HEX if you're thinking in terms of light mixtures
• Good for scripting or dynamic color changes in JavaScript
• You can use an alpha channel ( rgba() ) to add transparency

Just keep in mind that older versions of CSS didn't support alpha in rgb() directly — that's where rgba() came in handy. But now, modern CSS lets you write rgb() with a fourth parameter for opacity using modern color syntax.

HSL – work with hue, saturation, and lightness

HSL stands for Hue, Saturation, Lightness. This model gives you more intuitive control over color relationships.

• Uses the hsl() function
• Example: hsl(20, 100%, 60%)

Here's how it breaks down:

• Hue : a degree on the color wheel from 0 to 360 (red = 0°, green = 120°, blue = 240°)
• Saturation : percentage from 0% (grayscale) to 100% (fully saturated)
• Lightness : how bright the color is, 0% is black, 100% is white

Why HSL might be your go-to:

• Easier to tweak colors without guessing values
• Makes creating color variations (like lighter/darker tones) much more predictable
• Also supports alpha via hsla() or newer hsl() with transparency

This format really shines when you're building themes or need consistent color palettes with slight variations.

So yeah, whether you stick with HEX for simplicity, go with RGB for scripting control, or use HSL for easier color adjustments — they all get the job done. It really depends on what you're building and how much flexibility you need.

基本上就這些。

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