CSS如何实现弹出可拖动的DIV层提示窗口？

施主同西否精华 2016-11-30

以下是W3Cschool官网整理的点击弹出可拖动的DIV层代码：可拖动DIV 层（背景变暗）演示结果图：

可拖动DIV层（背景变暗）

具体代码如下（复制即可使用）：

<!DOCTYPE html> 
<html> 
<head> 
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> 
<title>W3Cschool可拖动DIV提示窗口</title> 
<script language="javascript"> 
function alertWin(title, msg, w, h){ 
var titleheight = "22px"; // 提示窗口标题高度 
var bordercolor = "#666699"; // 提示窗口的边框颜色 
var titlecolor = "#FFFFFF"; // 提示窗口的标题颜色 
var titlebgcolor = "#666699"; // 提示窗口的标题背景色 
var bgcolor = "#FFFFFF"; // 提示内容的背景色 


var iWidth = document.documentElement.clientWidth; 
var iHeight = document.documentElement.clientHeight; 
var bgObj = document.createElement("div"); 
bgObj.style.cssText = "position:absolute;left:0px;top:0px;width:"+iWidth+"px;height:"+Math.max(document.body.clientHeight, iHeight)+"px;filter:Alpha(Opacity=30);opacity:0.3;background-color:#000000;z-index:101;"; 
document.body.appendChild(bgObj); 


var msgObj=document.createElement("div"); 
msgObj.style.cssText = "position:absolute;font:11px '宋体';top:"+(iHeight-h)/2+"px;left:"+(iWidth-w)/2+"px;width:"+w+"px;height:"+h+"px;text-align:center;border:1px solid "+bordercolor+";background-color:"+bgcolor+";padding:1px;line-height:22px;z-index:102;"; 
document.body.appendChild(msgObj); 


var table = document.createElement("table"); //www.w3cschool.cn w3cschool
msgObj.appendChild(table); 
table.style.cssText = "margin:0px;border:0px;padding:0px;"; 
table.cellSpacing = 0; 
var tr = table.insertRow(-1); 
var titleBar = tr.insertCell(-1); 
titleBar.style.cssText = "width:100%;height:"+titleheight+"px;text-align:left;padding:3px;margin:0px;font:bold 13px '宋体';color:"+titlecolor+";border:1px solid " + bordercolor + ";cursor:move;background-color:" + titlebgcolor; 
titleBar.style.paddingLeft = "10px"; 
titleBar.innerHTML = title; 
var moveX = 0; 
var moveY = 0; 
var moveTop = 0; 
var moveLeft = 0; 
var moveable = false; 
var docMouseMoveEvent = document.onmousemove; //www.w3cschool.cn w3cschool
var docMouseUpEvent = document.onmouseup; 
titleBar.onmousedown = function() { 
var evt = getEvent(); 
moveable = true; 
moveX = evt.clientX; 
moveY = evt.clientY; 
moveTop = parseInt(msgObj.style.top); 
moveLeft = parseInt(msgObj.style.left); 


document.onmousemove = function() { 
if (moveable) { 
var evt = getEvent(); 
var x = moveLeft + evt.clientX - moveX; //www.w3cschool.cn w3cschool
var y = moveTop + evt.clientY - moveY; 
if ( x > 0 &&( x + w < iWidth) && y > 0 && (y + h < iHeight) ) { 
msgObj.style.left = x + "px"; 
msgObj.style.top = y + "px"; 
} 
} 
}; 
document.onmouseup = function () { 
if (moveable) { 
document.onmousemove = docMouseMoveEvent; //www.w3cschool.cn w3cschool
document.onmouseup = docMouseUpEvent; 
moveable = false; 
moveX = 0; 
moveY = 0; 
moveTop = 0; 
moveLeft = 0; 
} 
}; 
} 


var closeBtn = tr.insertCell(-1); 
closeBtn.style.cssText = "cursor:pointer; padding:2px;background-color:" + titlebgcolor; 
closeBtn.innerHTML = "<span style='font-size:15pt; color:"+titlecolor+";'>×</span>"; 
closeBtn.onclick = function(){ 
document.body.removeChild(bgObj); 
document.body.removeChild(msgObj); 
} 
var msgBox = table.insertRow(-1).insertCell(-1); 
msgBox.style.cssText = "font:10pt '宋体';"; 
msgBox.colSpan = 2; 
msgBox.innerHTML = msg; 


// 获得事件Event对象，用于兼容IE和FireFox 
function getEvent() { 
return window.event || arguments.callee.caller.arguments[0]; 
} 
} 
</script> 
</head> 
<body> 
<input type="button" value="w3cschool" onclick="alertWin('演示','我是<a href=\\'http://www.w3cschool.cn/cssref\\'>CSS参考手册</a>内容300是宽度200是高度',300,200);" /> 
</body> 
</html>