2020-03-12から1日間の記事一覧
Each child in a list should have a unique "key" prop. 今日はreactでもおなじみのmapオブジェクトで起こったエラーについて。 draw(d){ let s = { position: "absolute", left: (d.x - 25) + "px", top: (d.y -25) + "px", width: "50px", height: "50px"…
Each child in a list should have a unique "key" prop. 今日はreactでもおなじみのmapオブジェクトで起こったエラーについて。 draw(d){ let s = { position: "absolute", left: (d.x - 25) + "px", top: (d.y -25) + "px", width: "50px", height: "50px"…