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Ts 中这两种类型申明有什么区别，除了报错以外

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Ts 中这两种类型申明有什么区别，除了报错以外

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  1. 强制类型转换 强制将空对象转换为A类型
    但若对象不为空。拥有非a,b属性，也还是会报错。【报错转换类型失败】
  2. 直接规范类型

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