「黄金長方形の軌跡」で回転せよ!そこには「無限に続く力」があるはずだ・・・

javascriptの練習。
黄金比と白銀比を計算するフォーム。 > (ポップアップで開く)ポップアップはIEじゃ動かなかったなぁ。

作ってる途中で思った事、勘違いした事などを思い出してメモ

getElementsByTagName

こんなhtmlがあった時

次みたいな書き方したら全てのinputタグにアクセスして、valueを「チェンジ」に変更できると思ってた。でも出来ない。

こうする。

.onkeyup

なんか入力したら処理。
submitボタンとblurかfocusで計算を開始させていたんだけど、面倒臭かったのでonkeyupにした。

forの中”this”が自分を参照してた、これ普通だっけ?
iを使うと最後のiしかとれないんだっけ?

isFinite(変数とか数式とか文字列とか)

数値かどうか調べる、数値ならtrueを返してくれるらしい。

それなのに不思議だなと思う事。

parseInt()かNumber()を使わないと
どっちも数字のハズの$a.valueと$b.valueを足してるのにstringになる。
第2引数を指定してないparseInt()は、01や02などの文字列を渡すと8進数と解釈するらしい。

その他

ifで分岐させるとき、「値が入ってなかったらtrue」みたいにしたい時

どうやるのが正しいんだろう。

あと何か思い出したら書いていきます。


“「黄金長方形の軌跡」で回転せよ!そこには「無限に続く力」があるはずだ・・・” への3件のコメント

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