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1px 透明的 gif

1. 字节小, 43 bytes

2. 支持跨域, 兼容场景多，零配置

https://en.wikipedia.org/wiki/GIF

demo

https://log.mmstat.com/y.gif

https://mercury.jd.com/log.gif

https://dig.lianjia.com/bigc.gif

transparent.gif 42 bytes

Transparent.gif ‎(1 × 1 pixels, file size: 42 bytes, MIME type: image/gif)

1px gif 42 bytes

https://commons.wikimedia.org/wiki/File:Transparent.gif

https://upload.wikimedia.org/wikipedia/commons/c/ce/Transparent.gif

埋点/上报

1. 使用的img标签get请求

2. navigator.sendBeacon

https://developer.aliyun.com/article/752954

Beacon API

https://www.cnblogs.com/xgqfrms/p/13599628.html

refs

https://www.infoq.cn/video/9otJAEvtrI1bJ2ZpgmNs

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