fontfaceobserver
Detect if web fonts are available
- 版本：
- 资源类型：
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https://cdnjs.webstatic.cn/ajax/libs/fontfaceobserver/2.3.0/fontfaceobserver.js
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https://cdnjs.webstatic.cn/ajax/libs/fontfaceobserver/2.3.0/fontfaceobserver.min.js
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https://cdnjs.webstatic.cn/ajax/libs/fontfaceobserver/2.3.0/fontfaceobserver.standalone.js
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https://cdnjs.webstatic.cn/ajax/libs/fontfaceobserver/2.3.0/fontfaceobserver.standalone.min.js