标签:box 放大镜 slider background 淘宝 var document event
<!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>淘宝放大镜</title>
</head>
<style>
*{
padding: 0;
margin: 0;
}
.box {
position: relative;
width: 400px;
height: 400px;
background: url("https://gd1.alicdn.com/imgextra/i4/3254871797/O1CN01fl5Mnn1P94OsnySJB_!!3254871797.jpg");
background-size: 100%;
}
.slider {
position: absolute;
width: 100px;
height: 100px;
background: black;
opacity: .3;
}
.small {
position: absolute;
top: 100px;
right: -300px;
width: 100px;
height: 100px;
background: url("https://gd1.alicdn.com/imgextra/i4/3254871797/O1CN01fl5Mnn1P94OsnySJB_!!3254871797.jpg") no-repeat;
background-size: 400px 400px;
background-position: 0px 0px;
transform: scale(1.5);
}
</style>
<body>
<div class="box">
<div class="slider"></div>
<div class="small"></div>
</div>
</body>
<script>
var slider = document.querySelector(".slider");
var box = document.querySelector(".box");
var small = document.querySelector(".small");
//鼠标按下
slider.onmousedown = function(event){
var e = event || window.event;
var startX = e.offsetX;
var startY = e.offsetY;
//鼠标移动
document.onmousemove = function(event) {
var e1 = event ||window.event;
var l = e1.clientX - startX;
var t = e1.clientY - startY;
if(l> (box.clientWidth - slider.clientWidth)) {
l = box.clientWidth - slider.clientWidth;
}else if(l < 0) l = 0;
if(t> (box.clientHeight - slider.clientHeight)) {
t = box.clientHeight - slider.clientHeight;
}else if(t < 0) t = 0;
slider.style.left = l + 'px';
slider.style.top = t + 'px';
//修改小图片的背景图定位
small.style.backgroundPosition ="-" + l + "px -" + t + "px";
}
}
//鼠标松开
document.onmouseup = function(){
document.onmousemove = null;
}
</script>
</html>
标签:box,放大镜,slider,background,淘宝,var,document,event 来源: https://blog.csdn.net/bznhlhh/article/details/115615326
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