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move_follow mouse.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>move_follow mouse</title>
<style>
* {
margin:0;
padding: 0;
}
body {
overflow: hidden;
}
.temp {
position: absolute;
border: 1px dashed #000;
}
#follow {
position: absolute;
width: 200px;
height: 250px;
background-color: #ccc;
}
</style>
<script type='text/javascript' src='js/common.js'></script>
<script>
window.onload = function() {
var oDiv = document.getElementById('follow');
var Width = document.body.clientWidth || document.documentElement.clientWidth;
var Height = document.body.clientHeight || document.documentElement.clientHeight;
var disX = 0;
var disY = 0;
oDiv.onmousedown = function(ev) {
var evt = ev || window.event;
var temp = document.createElement('div');
temp.className = 'temp';
temp.style.width = this.offsetWidth - 2 + 'px';
temp.style.height = this.offsetHeight - 2 + 'px';
temp.style.left = this.offsetLeft + 'px';
temp.style.right = this.offsetTop + 'px';
document.body.appendChild(temp);
disX = evt.clientX - (this.offsetLeft - this.parentNode.scrollLeft);
disY = evt.clientY - (this.offsetTop - this.parentNode.scrollTop);
if (temp.setCapture)
{
temp.setCapture();
temp.onmousemove = mousemove;
temp.onmouseup = mouseup;
return false;
} else {
document.onmousemove = mousemove;
document.onmouseup = mouseup;
}
function mousemove(ev) {
var evt = ev || window.event;
var l = evt.clientX - disX;
var t = evt.clientY - disY;
if (l<0) {
l = 0;
} else if (l>Width - temp.offsetWidth) {
// 父元素的可视宽度小于 元素的宽度会导致BUG（设计师会那么无聊吗？）
l = Width - temp.offsetWidth;
}
if(t<0) {
t = 0;
} else if (t>Height - temp.offsetHeight) {
// 同上
t = Height - temp.offsetHeight;
}
temp.style.left = l + 'px';
temp.style.top = t + 'px';
}
function mouseup() {
this.onmousemove = null;
this.onmouseup = null;
oDiv.style.left = temp.offsetLeft + 'px';
oDiv.style.top = temp.offsetTop + 'px';
document.body.removeChild(temp);
if(this.setCaputa) {
this.releaseCapture();
}
}
};
};
</script>
</head>
<body>
<div id='follow'>
</div>
</body>
</html>