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並前往https://codingjournal.wordpress.com/2017/08/02/how-to-update-an-element-of-a-state-array-in-reactjs/

How to update an element of a state array in ReactJS - Coding ...

newArray automatically updated array2d , even if I hadn't called this.setState ! If you are busy, jump to the solution, or else read on to ...

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