我尝试使用querySelector All。我在按钮上加了onclick。我做了一个函数，想要更改divs背景。但即使我点击了按钮，我也不工作。我想知道我做错了什么
<!DOCTYPE html>
<html lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<script src="jquery-3.5.1.min.js"></script>
<link rel="stylesheet" href="stil.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
</head>
<body>
<button type="button" onclick="basla()">TIKLA</button> I ADDED ONCLİCK TO START FUNCTION
<div id="kutu1" class="kutu"></div>
<div id="kutu2" class="kutu"></div>
<div id="kutu3" class="kutu"></div>
<script>
function basla () {
var kutular = document.querySelectorAll(".kutu");
kutular.style.background = "white";
}
</script>
</body>
</html>
document.querySelectorAll返回一个NodeList。您不能直接访问NodeList上的.style。
var kutular = document.querySelectorAll(".kutu");
kutular.style.background = "white"; // ❌
必须使用for..of迭代生成的NodeList
var kutular = document.querySelectorAll(".kutu");
for (const elem of kutular) {
elem.style.background = "white"; // ✅
}