</head>
<style type="text/css">
li{
list-style: none;
}
body{
background: url(img/1.jpg) no-repeat center top;
}
*{
padding: 0;
margin: 0;
}
.bu{
overflow: hidden;
margin: 100px auto;
background-color: aliceblue;
width: 410px;
padding-top: 3px;
}
.bu li{
float: left;
margin: 0 1px;
cursor: pointer;
}
.bu img{
width:100px;
}
<body>
<ul class="bu">
<li><img src="img/1.jpg"></li>
<li><img src="img/2.webp"></li>
<li><img src="img/3.webp"></li>
<li><img src="img/img1.jpg"></li>
</ul>
</style>
<script type="text/javascript">
var imgs =document.querySelector('.bu').querySelectorAll(img);
//console.log(imgs);
for(var i=0; i < imgs.lenght; i++){
imgs[i].onclick =function (){
console.log(this.src);
}
}
</script>
</body>
从哪复制的，我复制你的一堆错的
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
li {
list-style: none;
}
body {
background: url(img/1.jpg) no-repeat center top;
}
* {
padding: 0;
margin: 0;
}
.bu {
overflow: hidden;
margin: 100px auto;
background-color: aliceblue;
width: 410px;
padding-top: 3px;
}
.bu li {
float: left;
margin: 0 1px;
cursor: pointer;
}
.bu img {
width: 100px;
}
</style>
</head>
<body>
<ul class="bu">
<li><img src="img/1.jpg"></li>
<li><img src="img/2.webp"></li>
<li><img src="img/3.webp"></li>
<li><img src="img/img1.jpg"></li>
</ul>
<script type="text/javascript">
var imgs = document.querySelector('.bu').querySelectorAll("img");
console.log(imgs);
for (var i = 0; i < imgs.lenght; i++) {
imgs[i].onclick = function () {
console.log(this.src);
}
}
</script>
</body>
</html>
var imgs =document.querySelector('.bu').querySelectorAll('img');
这个img少了引号吧
Cannot read property 'querySelectorAll' of null
他为什么是空的啊
去掉.querySelector('.bu')