简单实现js放大镜效果
程序员文章站
2022-04-29 08:59:51
本文实例为大家分享了js放大镜效果展示的具体代码，供大家参考，具体内容如下
具体代码如下:
本文实例为大家分享了js放大镜效果展示的具体代码，供大家参考，具体内容如下
具体代码如下:
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>document</title>
<style>
body,div,img{
margin:0;
padding:0;
}
img{
display:block;
border:none;
}
#box{
position:absolute;
top:20px;
left:20px;
width:350px;
height:350px;
box-shadow:3px 3px 10px 0 #111111;
}
#box img{
width:100%;
height:100%;
}
#mark{
display:none;
position:absolute;
top:0;
left:0;
width:175px;
height:175px;
background:#000;
opacity: 0.5;
filter:alpha(opacity=50);
cursor:move;
}
#boxright{
display:none;
position:absolute;
top:20px;
left:380px;
width:350px;
height:350px;
overflow:hidden;
}
/*我们右侧的图片的大小是需要严格计算的:
mark的width是box的width的一半，那么我们的大图宽度也应该是小图的二倍
*/
#boxright img{
position:absolute;
top:0;
left:0;
width:200%;
height:200%;
}
</style>
</head>
<body>
<div id='box'>
<img src="img/iphone.jpg" alt="">
<div id='mark'></div>
</div>
<div id='boxright'>
<img src="img/iphone_big.jpg" alt="">
</div>
<script>
//放大镜的原理: 我们的mark横向是box的一半，纵向也是box的一半，那么右侧的大图横向（纵向）应该是左侧小图的2倍
var box = document.getelementbyid('box');
var mark = document.getelementbyid('mark');
var boxright = document.getelementbyid('boxright');
//设置mark这个盒子
function setposition(e){
var top = e.clienty - box.offsettop - (mark.offsetheight/2);
var left = e.clientx - box.offsetleft - (mark.offsetwidth/2);
//边界判断
var templ = 0,tempt = 0;
var minl = 0,mint = 0,maxl = box.offsetwidth - mark.offsetwidth,maxt = box.offsetheight - mark.offsetheight ;
if(left<minl){
mark.style.left = minl + "px";
templ = minl;
}else if(left>maxl){
mark.style.left = maxl + "px";
templ = maxl;
}else{
mark.style.left = left + "px";
templ = left;
}
if(top<mint){
mark.style.top = mint + "px";
tempt = mint;
}else if(top>maxt){
mark.style.top = maxt + "px";
tempt = maxt;
}else{
mark.style.top = top + "px";
tempt = top;
}
//右侧图片跟着运动:左侧移动多少，右侧跟着移动他的2倍即可
var oimg = boxright.getelementsbytagname("img")[0];
oimg.style.left = -templ*2 + "px";
oimg.style.top = -tempt*2 + "px";
}
box.onmouseenter = function(e){
e = e || window.event;
mark.style.display = "block";
setposition(e);
boxright.style.display = "block";
}
box.onmousemove = function(e){
e = e || window.event;
setposition(e);
}
box.onmouseleave = function(e){
e = e || window.event;
mark.style.display = "none";
boxright.style.display = "none";
}
</script>
</body>
</html>
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。
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