什么是PX到EM的转换？
将<strong>PX</strong>转换为<strong>EM</strong>是常见任务。Convert pixel values to EM units based on parent element font size.
转换原理
像素到EM的转换将像素值除以父元素的字体大小（通常为16px）。例如：24px ÷ 16 = 1.5em。
Common PX to EM Conversions
- 12px = 0.75em — small/caption text
- 14px = 0.875em — compact body text
- 16px = 1em — parent font size
- 20px = 1.25em — slightly larger text
- 24px = 1.5em — subheadings
- 32px = 2em — headings
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