Gia*_*oco 6 javascript types undefined child-nodes
你好,我是编码新手,有一个通用问题,我到处找,找不到解决方案。我正在关注一个 javascript 教程并遇到了这行特定的代码。childnode 声明属性 'backgroundColor' 未定义,我不知道为什么。
错误:“未捕获的类型错误:无法设置未定义的属性‘backgroundColor’”
<!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>
Run Code Online (Sandbox Code Playgroud)
使用children[0]代替childNodes[0]:
https://developer.mozilla.org/en-US/docs/Web/API/ParentNode/children
var sampDiv = document.getElementById("sampDiv");
sampDiv.children[0].style.backgroundColor = "red";Run Code Online (Sandbox Code Playgroud)
<!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>Run Code Online (Sandbox Code Playgroud)
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