实现功能:
模仿淘宝图片放大效果,鼠标移动到小图片的某一处,放大镜对应显示大图片的相应位置。
实现效果:
实现代码:
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>图片放大镜效果</title>
<script type="text/javascript" src="../js/jquery-3.2.1.min.js" ></script>
<style>
.min{
width: 350px;
height: 350px;
border: 1px solid black;
float: left;
position: relative;
margin: 50px 0 0 30px; }
.max{
width: 350px;
height: 350px;
border: 1px solid black;
float: left;
display: none;
overflow: hidden;
position: relative;
margin-left:30px ;
}
.max img{
position: absolute;
margin: 0 auto;
}
.fd{
width: 153.125px;
height: 153.125px;
background-color: skyblue;
opacity: 0.3;
position: absolute;
top: 0;
left: 0;
display: none;
cursor: move;
}
</style>
</head>
<body>
<div class="min">
<img src="../img/0.jpg" width="350px" height="350px"/>
<div class="fd"></div>
</div>
<div class="max">
<img src="../img/0.jpg"/>
</div> <script>
var min = document.querySelector(".min");
var max = document.querySelector(".max");
var img = document.querySelector(".max img");
var fd = document.querySelector(".fd"); min.onmouseover = function(){
// 1.鼠标覆盖显示max和fd
max.style.display = "block";
fd.style.display = "block";
}
// 离开时隐藏
min.onmouseout = function(){
max.style.display = "none";
fd.style.display = "none";
}
// 2. fd的移动范围
min.onmousemove = function(){
// 鼠标触摸的点
var x = event.clientX-min.offsetLeft-fd.offsetWidth/2;
var y = event.clientY-min.offsetTop-fd.offsetHeight/2;
// 最大移动距离
var maxX = min.clientWidth-fd.offsetWidth;
var maxY = min.clientHeight-fd.offsetHeight;
// 边界判断
if (x <= 0) {
x = 0;
}else if (x >= maxX) {
x = maxX;
}
if (y <= 0) {
y = 0;
}else if (y >= maxY) {
y = maxY;
}
// fd的位置
fd.style.left = x+'px';
fd.style.top = y+'px';
//fd/min = max/img
//移动比例
var moveX = x/maxX;
var moveY = y/maxY;
// 移动
// 3. max的对应显示
// 对于大图而言,放大镜在小图上移动的比例相当于img在可显示区域上移动的比例
// 放大镜右移等于图片左移
// 也就是本质上为img-max 然而而需要负值,则*-1简化后为max-img
img.style.left = moveX*(max.clientWidth - img.offsetWidth) + 'px';
img.style.top = moveY*(max.clientHeight - img.offsetHeight) + 'px'; } </script>
</body>
</html>