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JS弹出可拖拽可关闭的div层完整实例

时间：2020-06-30 20:45 编辑：来源：阅读：
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摘要：JS弹出可拖拽可关闭的div层完整实例

本文实例讲述了JS弹出可拖拽可关闭的div层完整实现方法。分享给大家供大家参考。具体实现方法如下：

<!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弹出可拖拽可关闭的div层</title>

<style>

html,body{height:100%;overflow:hidden;}

body,div,h2{margin:0;padding:0;}

body{font:12px/1.5 Tahoma;}

center{padding-top:10px;}

button{cursor:pointer;}

#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 oWin = document.getElementById("win");

 var oBtn = document.getElementsByTagName("button")[0];

 var oClose = document.getElementById("close");

 var oH2 = oWin.getElementsByTagName("h2")[0];

 var bDrag = false;

 var disX = disY = 0;

 oBtn.onclick = function ()

 {

  oWin.style.display = "block"

 };

 oClose.onclick = function ()

 {

  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;

  disY = event.clientY - oWin.offsetTop; 

  this.setCapture && this.setCapture(); 

  return false

 };

 document.onmousemove = function (event)

 {

  if (!bDrag) return;

  var event = event || window.event;

  var iL = event.clientX - disX;

  var iT = event.clientY - disY;

  var maxL = document.documentElement.clientWidth - oWin.offsetWidth;

  var maxT = document.documentElement.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="win"><h2><span id="close">×</span></h2></div>

<center><button>弹出层</button></center>

</body>

</html>

希望本文所述对大家的javascript程序设计有所帮助。

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