Promising review: "Very few toys outlive wear and tear, but this has been a favorite in our house and has lasted through many ...

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这个概念在官方文档中没有明确的解释，只零星存在于 expression guidelines和 template statements章节之中 ... 可以简写的原因就是这里其实目标是实现 fontSizePx 的双向绑定，即子组件 app-sizer 中的 size 的改动更新可以冒泡到父组件中。sizeChange 则可以隐式 emit 出 size ...