console 命令行工具 X clear
console
<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>Document</title>
</head>
<body>
  <h1>测试最大值/最小值</h1>
  <form action="https://www.jikesn.com/demo/php/testif/41-test.php" method="post">
    num1: <input type="text" name="num1" id=""> <br>
    num2: <input type="text" name="num2" id=""> <br>
    num3: <input type="text" name="num3" id=""> <br>
    <input type="submit" value="测试">
  </form>
</body>
</html>