js .splice()
var removed = myFish.splice([i], 削除する数, '挿入する文字列');
凡庸性の高い.splice()。復習
[2]に要素を一つ追加する
var myFish = ['angel', 'clown', 'mandarin', 'drum','sturgeon'];
var removed = myFish.splice(2, 0, 'drum');
//myFishは["angel", "clown", "drum", "mandarin", "sturgeon"]
[3]から一つ取り除く
var myFish = ['angel', 'clown', 'drum', 'mandarin', 'sturgeon'];
var removed = myFish.splice(3, 1);
// myFish は ["angel", "clown", "drum",'mandarin', "sturgeon"]
// removed は ["mandarin"]
[2]から一つ取り除き、そこへ一つ挿入する
var myFish = ['angel', 'clown', 'drum', 'trumpet','sturgeon'];
var removed = myFish.splice(2, 1, 'trumpet');
// myFish は ["angel", "clown", "trumpet", "sturgeon"] // removed は ["drum"]