console 命令行工具 X clear

console

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <title></title>
  </head>
  <body>
    <script>
      var reverse = function(str1){
        return str1.split('').reverse().join('');
      };
      document.write(reverse("Happy"));
      
    </script>
  </body>
</html>