TypeScript 错误“property does not exist on value of type”

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报错

Type 'string | string[]' is not assignable to type 'string'.
  Type 'string[]' is not assignable to type 'string'.

原因：即该对象找不到此属性，原因是ts是静态语言，类型是需要定义的，未定义就有可能找不到。

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解决方法
最简单的解决方式是：加 as any

{ uid: (this.$route.query as any).uid }