Inserting oj css at runtime only works the first time

描述

贡献者指南

技术栈

javascripthtmlcss

领域

frontend

议题类型

bug

难度面向新贡献者的预计实现难度，1 表示很小改动，5 表示专家级工作。

3

预计时间有经验贡献者完成调查、实现、测试并准备 pull request 的粗略时间范围。

1-3 hours

活动状态议题当前的可参与程度：新鲜、活跃、陈旧、阻塞或等待维护者输入。

stale

清晰度议题是否清楚说明期望改动、验收标准和下一步。

mostly clear

前置要求

JavaScript basicsDOM manipulationCaching patterns

新手友好度1-100 的估计分数，表示该议题对首次贡献者的友好程度。

45

研究方向

Investigate the codebase, likely in the main oj source file (e.g., oj.js), to find where CSS strings are inserted into the DOM at runtime. Currently, inserting CSS only works the first time because there is no mechanism to track and update previously inserted CSS. The fix should implement a global cache (e.g., a Map) that stores references to style elements or CSS rules, and on subsequent calls, remove or update the previous insertion. This will require understanding the current insertion method and ensuring the cache is properly cleared when overriding CSS changes.