console 命令行工具 X clear

console

<!DOCTYPE html>
<html>
  <head>
    <meta charset="UTF-8" />
    <title></title>
  </head>
    <script>
      var str ="Rome was not built in a day";
      var sum =0;
      for(var i of str)
      {
                if (i != " ") {
                    sum++;
                }
      }
      document.write(sum);
    </script>
</html>