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magnifying.html
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magnifying.html
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<!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>无标题文档</title>
<style type="text/css">
#div1 {
width: 180px;
height: 180px;
position: relative;
}
#img1 {
display: block;
}
#div2 {
width: 100px;
height: 100px;
display: none;
position: absolute;
background: #FF0;
opacity: 0.5;
filter: alpha(opacity=50);
}
#div3 {
width: 400px;
height: 400px;
border: 1px #000 solid;
position: absolute;
top: 8px;
left: 200px;
overflow: hidden;
}
#img2 {
position: absolute;
left: 0;
display: block;
top: 0;
}
</style>
</head>
<script type="text/javascript">
window.onload = function () {
var oDiv1 = document.getElementById("div1");
var oImg1 = oDiv1.getElementsByTagName("img")[0];
var oDiv2 = oDiv1.getElementsByTagName("div")[0];
var oDiv3 = document.getElementById("div3");
var oImg2 = document.getElementById("img2");
oDiv1.onmouseenter = function () {
oDiv2.style.display = 'block';
};
oDiv1.onmouseleave = function () {
oDiv2.style.display = 'none';
};
oDiv1.onmousemove = function (ev) {
var ev = ev || event;
var L = ev.clientX - oDiv2.offsetWidth / 2;
var T = ev.clientY - oDiv2.offsetHeight / 2;
if (L < 0) {
L = 0;
}
else if (L > oDiv1.offsetWidth - oDiv2.offsetWidth) {
L = oDiv1.offsetWidth - oDiv2.offsetWidth;
}
if (T < 0) {
T = 0;
}
else if (T > oDiv1.offsetHeight - oDiv2.offsetHeight) {
T = oDiv1.offsetHeight - oDiv2.offsetHeight;
}
scaleX = L / (oDiv1.offsetWidth - oDiv2.offsetWidth);
scaleY = T / (oDiv1.offsetHeight - oDiv2.offsetHeight);
oImg2.style.left = (oDiv3.clientWidth - oImg2.offsetWidth) * scaleX + "px";//div3不包含边框的宽
oImg2.style.top = (oDiv3.clientHeight - oImg2.offsetHeight) * scaleY + "px";
//alert(oImg2.offsetWidth);
oDiv2.style.left = L + "px";
oDiv2.style.top = T + "px";
}
}
</script>
<body>
<div id="div1">
<img id="img1" src="img/b2.jpg"/>
<div id="div2"></div>
</div>
<div id="div3">
<img id="img2" src="img/b1.jpg"/>
</div>
<!--运用了onmouseenter，onmouseleave，onmousemove事件，以及client,offset-->
</body>
</html>