为什么这个文本不更新?

Why is this text not updating?

我创建了一个简单的脚本,可以随机打开列表中的网站。我最近尝试添加一项功能,使用户能够选择每个页面打开和关闭之间的等待时间(以毫秒为单位)。这是我的代码:

<!DOCTYPE html>
<html>



  <head>

    <title>Smokescreen</title>

  </head>

  <body align="center" style="font-family:monospace">

    <h2 align="center" style="font-family:monospace">
      SmokeScreen
    </h2>

    <h3 align="center" style="font-family:monospace">
      SmokeScreen is a JavaScript program that opens a random site every 3 seconds,
    </h3>

    <h3 align="center" style="font-family:monospace">
      to create a "smokescreen" over your browser history, preventing anyone from [easily] finding your information.
    </h3>

    <h4 align="center" style="font-family:monospace">To exit, close the original window that has the text "Smokescreen" in the title.</h4>


    <p align="center" style="font-family:monospace">

      <a href="github.com/keeganjk/smokescreen" style="font-family:monospace" align="center">Source Code / Learn More</a>
      <br />

      <div style="width: 300px; border: 25px solid #800000; margin:0 auto; font-family:monospace;" align="center">

        <h4 align="center" style="font-family:monospace">Milliseconds to wait before closing page:</h4>
        <h4 id="one" align="center" style="font-family:monospace"></h4>
        <button onclick="millisecs = prompt('New time to wait (in milliseconds)?'); if ( isNaN(milliseconds) ) {millisecs = millisecsBackup} else {millisecsBackup = millisecs} document.getElementById('one').innerHTML = millisecs;" style="font-family:monospace" align="center">Set Wait Time</button>
        <br />
        <br />

      </div>
      <br />

      <div style="margin:0 auto; font-family:monospace" align="center">

        <button onclick="getRandom(0, list.length, millisecs);" style="font-family:monospace" align="center">Start!</button>

      </div>

    </p>


  <script src="script.js"></script>
  <script>
      var millisecs = 3000;
      var millisecsBackup = 3000;
      document.getElementById("one").innerHTML = millisecs;
  </script>

  </body>



</html>

出于某种原因,当我输入不同的数字时,h4idone 中的文本不会更新。我做错了什么?

您正在检查 if (isNaN(milliseconds)) 但您调用了您的变量 millisecs 所以它抛出了一个错误。

如果您使用的是现代浏览器,请尝试打开开发者工具(windows 上的 F12 / mac 上的 CMD+OPT+i)并检查控制台。

另外请考虑将您的内联样式/点击移动到 <style><script> 标签 :)