这是一个用javascript实现的弹出一个层，让层居中，并且可以拖拽喔,代码如下，复制粘贴后，保存成html，就可以直接看到效果喔 ，虽然界面有点丑，但功能实现了，希望大家一起来改进。
演示效果：
<html xmlns="http://www.w3.org/1999/xhtml"><head><title>wfuyu.com JS弹出层效果</title><script type="text/javascript">var x0 = 0, y0 = 0, x1 = 0, y1 = 0;var moveable = false;function startDrag(obj) {if (event.button == 1) {//0 没按键 1 按左键 2 按右键 3 按左和右键 4 按中间键 5 按左和中间键 6 按右和中间键 7 按所有的键obj.setCapture(); ////设置捕获范围var win = obj.parentNode; //得到层的父节点x0 = event.clientX;y0 = event.clientY;x1 = parseInt(win.offsetLeft);y1 = parseInt(win.offsetTop);moveable = true;}}function drag(obj) {if (moveable) {var win = obj.parentNode;var bodywidth = document.body.clientWidth;var bodyheight = document.body.clientHeight;var divwidth = win.clientWidth;var divheight = win.clientHeight;var x, y;//控制left边界if ((x1 + event.clientX - x0) < 0)//超过左边{x = 0;}else if ((x1 + event.clientX - x0 + divwidth) > bodywidth) {//超过右边x = bodywidth - divwidth;}else {x = x1 + event.clientX - x0;}//控制top边界if (y1 + event.clientY - y0 < 0) {//超过顶边y = 0;}else if ((y1 + event.clientY - y0 + divheight) > bodyheight) {//超过底边y = bodyheight - divheight;}else {y = y1 + event.clientY - y0;}win.style.left = x;win.style.top = y;}}function stopDrag(obj) {if (moveable) {obj.releaseCapture();moveable = false;}}function SetDivLayerAtCenter(objLayerName) {objLayer = document.getElementById(objLayerName);objLayer.style.top = document.body.clientHeight / 2 - objLayer.style.height.toLowerCase().replace('px', '') / 2;objLayer.style.left = document.body.clientWidth / 2 - objLayer.style.width.toLowerCase().replace('px', '') / 2;}function ShowDiv(objID) {SetDivLayerAtCenter(objID);document.getElementById(objID).style.display = "";}function HideDiv(objID) {document.getElementById(objID).style.display = "none";}// Downloads By http://www.wfuyu.com</script></head><body><a href="javascript:ShowDiv('SearchLay')" title="弹出层"> 弹出层</a><div id="SearchLay" style="position: absolute; left: 15px; top: 69px; width: 225px; height: 225px; z-index: 1; display: none;"><iframe style="position:absolute; z-index:-1; top:0; left:0; width: 100%; height:100%; filter:alpha(opacity=0);"></iframe><div onmousedown="startDrag(this)" onmouseup="stopDrag(this);" onmousemove="drag(this)"><table height="10" cellspacing="0" cellpadding="1" width="225" border="0"><tr><td width="100%" height="1" valign="top" class="SearchbgColor"><table height="21" cellspacing="0" cellpadding="0" width="100%"border="0"><tr><td style=" background-color:Yellow;">我是弹出层头</td><td align="center" width="50" style=" background-color:Yellow;"><a href="javascript:HideDiv('SearchLay')">关闭弹出层</a></td></tr></table><table bgcolor="blue" width="225"><tr><td height="20"></td></tr></table><table cellspacing="0" cellpadding="0" width="225" border="0" bgcolor="blue"><tr><td height="100">我是弹出层，可以拖拽和关闭哦！！！</td></tr></table></td></tr></table></div></div></body></html><div style="text-align:center;margin:30px 0 0 0;"><hr style="color:#999;height:1px;">如不能显示效果，请按Ctrl+F5刷新本页，更多网页代码：<a href='http://www.wfuyu.com/' target='_blank'>http://www.wfuyu.com/</a></div>提示：可修改后代码再运行!
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