jS放大镜效果

时间：2023-03-09 08:21:04
jS放大镜效果

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="demo4.aspx.cs" Inherits="test.demo4" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">

<head>

<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>

<title>放大镜</title>

<meta name="keywords" content="" />

<meta name="Description" content="" />

<style type="text/css">

body,div,img {padding:0;margin:0;}

.con {width:256px;height:192px;float:left;}

.con img {width:256px;height:192px;position:absolute;border:1px blue solid;}

.dingwei {position:absolute;width:100px;height:100px;background-color:black;filter:alpha(opacity=20);opacity:0.2;cursor:move;display:none;}

.big {float:left;width:400px;height:400px;margin:100px;overflow:hidden;}

</style>

</head>

<body>

<div class="con" id="father" style="position:relative;">

<img src="img/2.jpg" alt="图片"/>

<div id="aa" class="dingwei">&nbsp;</div>

</div>

<div class="big" id="bpic">

<div class="inside"><img src="img/2.jpg" alt="图片"/></div>

</div>

<script type="text/javascript">

var divs = document.getElementById("aa");

 var fa = document.getElementById("father");

var maxWidth = maxHeight = S = 0;

  var big = document.getElementById("bpic");

 fa.onmouseover = function () {

 divs.style.display = "block";

 big.style.display = "block";

  S = divs.offsetHeight / 2;

maxWidth = fa.clientWidth - divs.offsetWidth;

 maxHeight = fa.clientHeight - divs.offsetHeight; //物块的活动范围；

   }

fa.onmousemove = function (e) {

 a = e || window.event;

  var sbX = a.clientX;

  var sbY = a.clientY;

var num = big.clientWidth / divs.clientWidth;

  var lf = sbX - S; //鼠标的位置减去元素位置的一半的值就是元素的定位值；

var tp = sbY - S;

 //tp =tp<0?0:tp>maxHeight?maxHeight:tp;

 //lf =lf<0?0:lf>maxWidth?maxWidth:lf;//判断物块的定位位置然后进行设置

 if (tp < 0) { tp = 0; }

else {

 if (tp > maxHeight) { tp = maxHeight; }

  else { tp = sbY - S; }

 }

  //判断物块的位置进行设置

   if (lf < 0) { lf = 0; }

else {

  if (lf > maxWidth) { lf = maxWidth; }

else { lf = sbX - S; }

 }

divs.style.left = lf + "px";

 divs.style.top = tp + "px";

big.scrollLeft = num * lf;

big.scrollTop = num * tp;

 }

fa.onmouseout = function () {

divs.style.display = "none";

  big.style.display = "none";

}

</script>

</body>

</html>

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