<!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>js可拖拽最大最小化弹出层窗口</title>
<style type="text/css">
body,div,h2{margin:0;padding:0;}
body{background:url(img/bg.jpg);font:12px/1.5 \5fae\8f6f\96c5\9ed1;color:#333;}
/* drag */
#drag{position:absolute;top:100px;left:100px;width:300px;height:160px;background:#e9e9e9;border:1px solid #444;border-radius:5px;box-shadow:0 1px 3px 2px #666;}
#drag .title{position:relative;height:27px;margin:5px;}
#drag .title h2{font-size:14px;height:27px;line-height:24px;border-bottom:1px solid #A1B4B0;}
#drag .title div{position:absolute;height:19px;top:2px;right:0;}
#drag .title a,a.open{float:left;width:21px;height:19px;display:block;margin-left:5px;background:url(img/tool.png) no-repeat;}
a.open{position:absolute;top:10px;left:50%;margin-left:-10px;background-position:0 0;}
a.open:hover{background-position:0 -29px;}
#drag .title a.min{background-position:-29px 0;}
#drag .title a.min:hover{background-position:-29px -29px;}
#drag .title a.max{background-position:-60px 0;}
#drag .title a.max:hover{background-position:-60px -29px;}
#drag .title a.revert{background-position:-149px 0;display:none;}
#drag .title a.revert:hover{background-position:-149px -29px;}
#drag .title a.close{background-position:-89px 0;}
#drag .title a.close:hover{background-position:-89px -29px;}
#drag .content{overflow:auto;margin:0 5px;}
#drag .resizeBR{position:absolute;width:14px;height:14px;right:0;bottom:0;overflow:hidden;cursor:nw-resize;background:url(img/resize.png) no-repeat;}
#drag .resizeL,#drag .resizeT,#drag .resizeR,#drag .resizeB,#drag .resizeLT,#drag .resizeTR,#drag .resizeLB{position:absolute;background:#000;overflow:hidden;opacity:0;filter:alpha(opacity=0);}
#drag .resizeL,#drag .resizeR{top:0;width:5px;height:100%;cursor:w-resize;}
#drag .resizeR{right:0;}
#drag .resizeT,#drag .resizeB{width:100%;height:5px;cursor:n-resize;}
#drag .resizeT{top:0;}
#drag .resizeB{bottom:0;}
#drag .resizeLT,#drag .resizeTR,#drag .resizeLB{width:8px;height:8px;background:#FF0;}
#drag .resizeLT{top:0;left:0;cursor:nw-resize;}
#drag .resizeTR{top:0;right:0;cursor:ne-resize;}
#drag .resizeLB{left:0;bottom:0;cursor:ne-resize;}
</style>
<script type="text/javascript">
/*-------------------------- +
获取id, class, tagName
+-------------------------- */
var get = {
byId: function(id) {
return typeof id === "string" ? document.getElementById(id) : id
},
byClass: function(sClass, oParent) {
var aClass = [];
var reClass = new RegExp("(^| )" + sClass + "( |$)");
var aElem = this.byTagName("*", oParent);
for (var i = 0; i < aElem.length; i++) reClass.test(aElem[i].className) && aClass.push(aElem[i]);
return aClass
},
byTagName: function(elem, obj) {
return (obj || document).getElementsByTagName(elem)
}
};
var dragMinWidth = 250;
var dragMinHeight = 124;
/*-------------------------- +
拖拽函数
+-------------------------- */
function drag(oDrag, handle)
{
var disX = dixY = 0;
var oMin = get.byClass("min", oDrag)[0];
var oMax = get.byClass("max", oDrag)[0];
var oRevert = get.byClass("revert", oDrag)[0];
var oClose = get.byClass("close", oDrag)[0];
handle = handle || oDrag;
handle.style.cursor = "move";
handle.onmousedown = function (event)
{
var event = event || window.event;
disX = event.clientX - oDrag.offsetLeft;
disY = event.clientY - oDrag.offsetTop;
document.onmousemove = function (event)
{
var event = event || window.event;
var iL = event.clientX - disX;
var iT = event.clientY - disY;
var maxL = document.documentElement.clientWidth - oDrag.offsetWidth;
var maxT = document.documentElement.clientHeight - oDrag.offsetHeight;
iL <= 0 && (iL = 0);
iT <= 0 && (iT = 0);
iL >= maxL && (iL = maxL);
iT >= maxT && (iT = maxT);
oDrag.style.left = iL + "px";
oDrag.style.top = iT + "px";
return false
};
document.onmouseup = function ()
{
document.onmousemove = null;
document.onmouseup = null;
this.releaseCapture && this.releaseCapture()
};
this.setCapture && this.setCapture();
return false
};
//最大化按钮
oMax.onclick = function ()
{
oDrag.style.top = oDrag.style.left = 0;
oDrag.style.width = document.documentElement.clientWidth - 2 + "px";
oDrag.style.height = document.documentElement.clientHeight - 2 + "px";
this.style.display = "none";
oRevert.style.display = "block";
};
//还原按钮
oRevert.onclick = function ()
{
oDrag.style.width = dragMinWidth + "px";
oDrag.style.height = dragMinHeight + "px";
oDrag.style.left = (document.documentElement.clientWidth - oDrag.offsetWidth) / 2 + "px";
oDrag.style.top = (document.documentElement.clientHeight - oDrag.offsetHeight) / 2 + "px";
this.style.display = "none";
oMax.style.display = "block";
};
//最小化按钮
oMin.onclick = oClose.onclick = function ()
{
oDrag.style.display = "none";
var oA = document.createElement("a");
oA.className = "open";
oA.href = "javascript:;";
oA.title = "还原";
document.body.appendChild(oA);
oA.onclick = function ()
{
oDrag.style.display = "block";
document.body.removeChild(this);
this.onclick = null;
};
};
//阻止冒泡
oMin.onmousedown = oMax.onmousedown = oClose.onmousedown = function (event)
{
this.onfocus = function () {this.blur()};
(event || window.event).cancelBubble = true
};
}
/*-------------------------- +
改变大小函数
+-------------------------- */
function resize(oParent, handle, isLeft, isTop, lockX, lockY)
{
handle.onmousedown = function (event)
{
var event = event || window.event;
var disX = event.clientX - handle.offsetLeft;
var disY = event.clientY - handle.offsetTop;
var iParentTop = oParent.offsetTop;
var iParentLeft = oParent.offsetLeft;
var iParentWidth = oParent.offsetWidth;
var iParentHeight = oParent.offsetHeight;
document.onmousemove = function (event)
{
var event = event || window.event;
var iL = event.clientX - disX;
var iT = event.clientY - disY;
var maxW = document.documentElement.clientWidth - oParent.offsetLeft - 2;
var maxH = document.documentElement.clientHeight - oParent.offsetTop - 2;
var iW = isLeft ? iParentWidth - iL : handle.offsetWidth + iL;
var iH = isTop ? iParentHeight - iT : handle.offsetHeight + iT;
isLeft && (oParent.style.left = iParentLeft + iL + "px");
isTop && (oParent.style.top = iParentTop + iT + "px");
iW < dragMinWidth && (iW = dragMinWidth);
iW > maxW && (iW = maxW);
lockX || (oParent.style.width = iW + "px");
iH < dragMinHeight && (iH = dragMinHeight);
iH > maxH && (iH = maxH);
lockY || (oParent.style.height = iH + "px");
if((isLeft && iW == dragMinWidth) || (isTop && iH == dragMinHeight)) document.onmousemove = null;
return false;
};
document.onmouseup = function ()
{
document.onmousemove = null;
document.onmouseup = null;
};
return false;
}
};
window.onload = window.onresize = function ()
{
var oDrag = document.getElementById("drag");
var oTitle = get.byClass("title", oDrag)[0];
var oL = get.byClass("resizeL", oDrag)[0];
var oT = get.byClass("resizeT", oDrag)[0];
var oR = get.byClass("resizeR", oDrag)[0];
var oB = get.byClass("resizeB", oDrag)[0];
var oLT = get.byClass("resizeLT", oDrag)[0];
var oTR = get.byClass("resizeTR", oDrag)[0];
var oBR = get.byClass("resizeBR", oDrag)[0];
var oLB = get.byClass("resizeLB", oDrag)[0];
drag(oDrag, oTitle);
//四角
resize(oDrag, oLT, true, true, false, false);
resize(oDrag, oTR, false, true, false, false);
resize(oDrag, o
js可拖拽最大最小化弹出层窗口可通过八个方向改变大小.zip
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js可拖拽最大最小化弹出层窗口可通过八个方向改变大小.zip （3个子文件） 
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