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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>
*{ margin: 0;padding: 0;list-style: none}
#div{ width: 100px;height: 100px;background: pink;position: absolute;}
</style>
<script>
window.onload = function() {
var odiv = document.getElementById('div');
var disX = 0;
var disY = 0;
var scrollTop = document.documentElement.scrollTop || document.body.scrollTop;
var scrollLeft = document.documentElement.scrollLeft || document.body.scrollLeft;
odiv.onmousedown = function(event) {
disX = event.clientX + scrollLeft - div.offsetLeft;
disY = event.clientY + scrollTop - div.offsetTop;
document.onmousemove = function(event) {
var l = event.clientX - disX;
var t = event.clientY - disY;
if (l <= 0) {
l = 0;
} else if (l > document.documentElement.clientWidth - odiv.offsetWidth) {
l = document.documentElement.clientWidth - odiv.offsetWidth;
}
if (t < 0) {
t = 0;
} else if (t > document.documentElement.clientHeight - odiv.offsetHeight) {
t = document.documentElement.clientHeight - odiv.offsetHeight;
}
odiv.style.left = l + 'px';
odiv.style.top = t + 'px';
}
document.onmouseup = function() {
document.onmousemove = null;
odiv.onmouseup = null;
}
return false;
}
}
</script>
</head>
<body>
<div id="div"></div>
</body>
</html>
|