[compositionApi](compositionApi.md) [1. 新特性](1.%E6%96%B0%E7%89%B9%E6%80%A7.md) [3. 生命周期](3.%E7%94%9F%E5%91%BD%E5%91%A8%E6%9C%9F.md) [6.定义props](6.%E5%AE%9A%E4%B9%89props.md)