解决当用户通过 zIndex prop 自定义弹窗层级时,遮罩层的 zIndex 不会自动关联内容层的 zIndex,导致层级关系错乱。 #1305
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类型处理不当:未统一转换为数字类型
逻辑分散:遮罩层 zIndex 的计算分散在两个组件中
缺乏关联性保证:无机制确保遮罩层 zIndex 始终基于内容层计算
边界值处理缺失:未对计算结果进行有效性检查