Question

您好我是编码的新手并且有一个通用的问题，我到处寻找并且无法找到解决方案。我正在关注一个javascript教程并遇到了这个特定的代码行。 childnode声明属性＆＃39; backgroundColor＆＃39;是不确定的，我不知道为什么。

错误：＆＃34;未捕获的类型错误：无法设置属性＆＃39; backgroundColor＆＃39;未定义＆＃34;

<!doctype html>
<html>
 <head>
 </head>
 <body>


 <div id = "sampDiv">

  <p> This is a txt field </p>

  <p> This is another txt field </p>

  </div>



  <script>

  var sampDiv = document.getElementById("sampDiv");

  sampDiv.childNodes[0].style.backgroundColor = "red";
</script> 


</body>
</html>

Answer 1

使用children[0]代替childNodes[0]：

https://developer.mozilla.org/en-US/docs/Web/API/ParentNode/children

＆＃13;

  var sampDiv = document.getElementById("sampDiv");

  sampDiv.children[0].style.backgroundColor = "red";

＆＃13;

<!doctype html>
<html>
  <head>
  </head>
  <body>
    <div id = "sampDiv">
      <p> This is a txt field </p>
      <p> This is another txt field </p>
    </div>
  </body>
</html>

＆＃13;

JavaScript ChildNodes未定义类型错误？

1 个答案: