请问
Spine web player里面可以在同一个
new spine.SpinePlayer("player-container", {})
里面切换不同的json&atlas再去执行动画吗

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No, the JSON (or binary) and atlas files must be downloaded and parsed by the player, and the PNG files for the atlas downloaded. You could load 2 players and swap them.

It could be nice to allow the player to load different files. I have added an issue to track this feature:
EsotericSoftware/spine-runtimes2506