feat: supports equal width fonts (#287)

- 加入字体新选项
- 更新示例文本以便观察区别

src/assets/scripts/config.js

@@ -3,12 +3,17 @@ export default {
     {
       label: `无衬线`,
       value: `-apple-system-font,BlinkMacSystemFont, Helvetica Neue, PingFang SC, Hiragino Sans GB , Microsoft YaHei UI , Microsoft YaHei ,Arial,sans-serif`,
-      desc: `Abc`,
+      desc: `字体123Abc`,
     },
     {
       label: `衬线`,
       value: `Optima-Regular, Optima, PingFangSC-light, PingFangTC-light, 'PingFang SC', Cambria, Cochin, Georgia, Times, 'Times New Roman', serif`,
-      desc: `Abc`,
+      desc: `字体123Abc`,
+    },
+    {
+      label: `等宽`,
+      value: `Menlo, Monaco, 'Courier New', monospace`,
+      desc: `字体123Abc`,
     },
   ],
   sizeOption: [