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请教下现在创建新项目默认的入口文件和示例组件都是jsx后缀，跟之前的和react创建的默认js有什么区别？ 自己创建组件应该用哪种呢？
没什么区别，突出你写的文件包含jsx语法。建议采用Taro官方的建议，组件使用jsx后缀