# 鼠标滚动 切换图片
主要使用：
- document.onwheel
# 事例
const targetImg = document.getElementById('target');
targetImg.onwheel = function(event) {
consol.log(event.deltaX); // 横向滚动距离
consol.log(event.deltaY); // 总想滚动距离
}
body.onwheel = function(event) {
return false; // 鼠标滚动时-禁止页面滚动
return true; // 鼠标滚动时-允许面滚动（默认）
}
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# 效果
# 代码
<!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>
html, body {
width: 100%;
height: 100%;
margin: 0;
padding: 0;
}
.box {
width: 100%;
height: 100%;
font-size: 30px;
}
.box img {
width: 100%;
}
</style>
</head>
<body>
<div class="box">
<div id="scrollText">滚动：0</div>
<img id="target" src="https://cdn.cnbj1.fds.api.mi-img.com/product-images/mi-f2a1-cond8f0c2c2/section-10-item_0.jpg">
<!-- https://cdn.cnbj1.fds.api.mi-img.com/product-images/mi-f2a1-cond8f0c2c2/section-10-item_39.jpg -->
</div>
<script>
const scale = 30;
let num = 0;
const scrollText = document.getElementById('scrollText');
const targetImg = document.getElementById('target');
targetImg.onwheel = function(event) {
// console.log(event.deltaY, Math.round(event.deltaY));
num += Math.round(event.deltaY);
let imgNum = Math.round(num/scale);
if( imgNum < 0 ) {
imgNum = 0;
num = 0;
}
if( imgNum > 39 ) {
imgNum = 39;
num = 39 * scale;
}
// console.log(imgNum);
scrollText.innerHTML = `滚动：${num}, img: ${imgNum}`;
targetImg.src = `https://cdn.cnbj1.fds.api.mi-img.com/product-images/mi-f2a1-cond8f0c2c2/section-10-item_${imgNum}.jpg`;
return false;
}
</script>
</body>
</html>
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