如何用其他图标替换 Discourse 图标？

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您不能仅仅从 font-awesome 切换到另一套图标，您需要加载新的图标并逐一替换当前的图标。

Replace Discourse's default SVG icons with custom icons in a theme

You can replace a Discourse’s default SVG icons individually or as a whole with your own custom SVG and override them within a theme or theme component. Step 1 - Create an SVG Spritesheet To get started, you must create an SVG Spritesheet. This can contain anything from a single additional custom SVG icon up to an entire replacement set of hundreds. The spritesheet should be saved as an SVG file. In principle, you are nesting the <svg> tag contents from the original SVG icon file into <symbol> …