1. UI 图常见数值对应 CSS 自重
      1. 100 - Thin
      2. 200 - Extra Light (Ultra Light)
      3. 300 - Light
      4. 400 - Regular (Normal、Book、Roman)
      5. 500 - Medium
      6. 600 - Semi Bold (Demi Bold)
      7. 700 - Bold
      8. 800 - Extra Bold (Ultra Bold)
      9. 900 - Black (Heavy)