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本文深度解析了 ReactDOM.createPortal() API 的核心机制。内容系统性地阐述了 Portal 如何实现组件的逻辑位置与物理 DOM 位置分离，并详细解析了其最关键特性——事件冒泡遵循 React 组件树的规则，而非物理 DOM 树。笔记通过模态框的经典应用案例，展示了如何利用 Portal 解决布局、z-index 和 overflow 等问题。
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