javascript-syntax/ch11.html at main · FlounderAround/javascript-syntax · GitHub

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<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
    <script>
      //변수식 선언방법
      var array1 = [10, 20, 30];
      alert(array1);
      //생성자 함수식 선언방법
      var array2 = new Array(40, 50, 60);
      alert(array2);

      document.write(array1.concat(array2) + '<br>');
      //맨 뒤 삭제
      array2.pop();
      //맨 앞 삭제
      array1.shift();
      //맨 뒤 추가
      array2.push(30);
      //맨 앞 추가
      array1.unshift(10);

      //sort, reverse
      var array3 = [11, 7, 23, 48, 9, 50];
      array3.sort();
      document.write('문자배열: ' + array3 + '<br>');
      //오름차순
      array3.sort(function (left, right) {
        return left - right;
      });
      document.write('오름차순: ' + array3 + '<br>');
      //내림차순
      array3.sort(function (left, right) {
        return right - left;
      });
      document.write('내림차순: ' + array3 + '<br>');

      //로또 번호 6자리
      var lotto = [];

      for (var i = 0; i < 6; i++) {
        var num = Math.floor(Math.random() * 44) + 1;
        for (var j in lotto) {
          if (num == lotto[j]) {
            num = Math.floor(Math.random() * 44) + 1;
          }
        }
        lotto.push(num);
      }

      lotto.sort(function (left, right) {
        return left - right;
      });
      alert(lotto);
    </script>
  </head>
  <body></body>
</html>