ばいおりんの慣性系相対性理論

プログラムの内容：

<!DOCTYPE html>
<html lang="ja">
<head>
<meta charset="UFT-8">
<meta name="Viewpoint" content="width=device-width,initial-scale-1.0">
<script>

class Point {
   constructor(x, y) {
      this.x = x;
      this.y = y;
                     }
   calc() {
      return this.x + this.y;
          }
            }

function main() {
   let str = "\n　";
   let n = eval(document.getElementById('ims1').value);
   let m = eval(document.getElementById('ims2').value);
   const point = new Point(n, m);
   str += point.x + " ＋ " + point.y + " ＝ " + point.calc();
   document.getElementById('ams').value = str;
                }

</script>
</head>
<body>
<section>
<form name="frm">
足される数 ＝ <input type="text" name="ins1" id="ims1" size="8" style="text-align:right">　　足す数 ＝ <input type="text" name="ins2" id="ims2" size="8" style="text-align:right"><br><br>
<input type="button" value="実行" onclick="main()">　<input type="reset" value="消去"><br><br>
<Ｔextarea name="ans" id="ams" rows="6" cols="70"></Ｔextarea>
</form>
</sectoin>
</body>
</html>