| domain | 可选 URL，用于定义要删除的 Cookie。只有适用于此 URL 的 Cookie 才会从缓存中删除。 |
清除缓存中存储的 Cookie。
Cookie 缓存仅存在于当前游戏会话中，并且在下次启动游戏时将清空。下面列出了例外情况。 此方法可以从缓存中删除 Cookie。如果未指定参数，则该方法将删除缓存中的所有 Cookie。如果指定了字符串参数，则该方法仅删除应用于给定 URL 的 Cookie。 iOS 具有系统提供的内置 Cookie 缓存，该缓存在游戏会话中持续存在。此方法可从内置缓存中删除 Cookie。 在 WebGL 上，Cookie 由浏览器管理，无法删除，所以此方法不会执行任何操作。
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