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javascript 配列の先頭や最後を削除したり配列に値を追加する

JavaScript

Posted at 2020-08-19


<!DOCTYPE html>
<html lang="ja">
<head>
    <meta charset="UTF-8">
    <title>課題</title>
    <script>
        var data = [59, 39, 100, 2, 15, 40, 84, 97];
 
        // 配列dataの先頭(59)の値を削除
        
        data.shift();
 
        // 配列dataの最後(97)の値を削除
        data.pop();
 
        // for文により配列dataの中身を表示
        for(var i = 0; i < data.length; i++){
            document.write('<p>'+data[i]+'</p>');
        }
 
    </script>
</head>
<body>
</body>
</html>



<!DOCTYPE html>
<html lang="ja">
<head>
   <meta charset="UTF-8">
   <title>challenge_object</title>
</head>
<body>
   <script>
       var fruits = new Array();
 
       fruits[0] = 'apple';
       fruits[1] = 'grape';
       fruits[2] = 'melon';
 
       // pushメソッドにより配列fruitsへorangeを追加
       fruits.push('orange')
   
       // for文により配列fruitsの中身を表示
       for(var i = 0; i < fruits.length; i++){
           document.write('<p>'+fruits[i]+'</p>')
       }
 
 
   </script>
</body>
</html>

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