console 命令行工具 X clear

console

<head>
  <meta charset="utf-8">
  <title>
    菜鸟教程(runoob.com)
  </title>
  <script>
    function open_win() {
      window.open("http://www.runoob.com");
    }
  </script>
</head>
<body>
  <form>
    <input type="button" value="打开窗口" onclick="open_win()">
  </form>
</body>