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並前往https://www.answerlib.com/question/17827/how-to-get-formarrayname-when-the-formarray-is-nested-in-another-formarray.html

但 - IT答乎

DOM <div formArrayName="cities"> 使用getter. get cities(): FormArray { return this.form.get('cities') as FormArray; } 一切都像魅力一样工作 ...

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