<!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>弹出层并可拖拽</title> <style> body,html{height:2000px;} body,div,h2{margin:0;padding:0;} body{font:12px/1.5 Tahoma;} center{padding-top:10px;} button{cursor:pointer;} #overlay{position:fixed;top:0;left:0;width:100%;height:100%;background:#000;opacity:0.5;filter:alpha(opacity=50);display:none;} *html #overlay{position:absolute;} #win{position:absolute;top:50%;left:50%;width:400px;height:200px;background:#fff;border:4px solid #f90;margin:-102px 0 0 -202px;display:none;} h2{font-size:12px;height:18px;text-align:right;background:#FC0;border-bottom:3px solid #f90;padding:5px;cursor:move;} h2 span{color:#f90;cursor:pointer;background:#fff;border:1px solid #f90;padding:0 2px;} </style> <script> window.onload = function () { var shit = !-[1, ]; var oWin = document.getElementById("win"); var oLay = document.getElementById("overlay"); var oBtn = document.getElementsByTagName("button")[0]; var oClose = document.getElementById("close"); var oH2 = oWin.getElementsByTagName("h2")[0]; var bDrag = false; var disX = disY = 0; var iScrollT = document.documentElement.scrollTop || document.body.scrollTop; var iScrollL = document.documentElement.scrollLeft || document.body.scrollLeft; oBtn.onclick = function () { oLay.style.display = "block"; oWin.style.display = "block"; shit && (oLay.style.height = document.body.offsetHeight + "px"); }; oClose.onclick = function () { oLay.style.display = "none"; oWin.style.display = "none"; }; oClose.onmousedown = function (event) { (event || window.event).cancelBubble = true; }; oH2.onmousedown = function (event) { var event = event || window.event; bDrag = true; disX = event.clientX - oWin.offsetLeft + iScrollL; disY = event.clientY - oWin.offsetTop + iScrollT; this.setCapture && this.setCapture(); return false }; document.onmousemove = function (event) { if (!bDrag) return; var event = event || window.event; var iL = event.clientX - disX + iScrollL; var iT = event.clientY - disY + iScrollT; var maxL = document.body.clientWidth - oWin.offsetWidth; var maxT = document.body.clientHeight - oWin.offsetHeight; iL = iL < 0 ? 0 : iL; iL = iL > maxL ? maxL : iL; iT = iT < 0 ? 0 : iT; iT = iT > maxT ? maxT : iT; oWin.style.marginTop = oWin.style.marginLeft = 0; oWin.style.left = iL + "px"; oWin.style.top = iT + "px"; return false }; document.onmouseup = window.onblur = oH2.onlosecapture = function () { bDrag = false; oH2.releaseCapture && oH2.releaseCapture(); }; }; </script> </head> <body> <div id="overlay"></div> <div id="win"><h2><span id="close">×</span></h2></div> <center><button>弹出层</button></center> </body> </html>