代码：【复制】 【运行】
<!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>
<title>
JavaScript弹出DIV层，页面背景渐变成半透明
</title>
<style>
html,body{font-size:12px;margin:0px;height:100%;} .mesWindow{border:#666
1px solid;background:#fff;} .mesWindowTop{border-bottom:#eee 1px solid;margin-left:4px;padding:3px;font-weight:bold;text-align:left;font-size:12px;}
.mesWindowContent{margin:4px;font-size:12px;} .mesWindow .close{height:15px;width:28px;border:none;cursor:pointer;text-decoration:underline;background:#fff}
</style>
<script>
var isIe = (document.all) ? true: false;
//设置select的可见状态
function setSelectState(state) {
var objl = document.getElementsByTagName('select');
for (var i = 0; i < objl.length; i++) {
objl[i].style.visibility = state;
}
}
function mousePosition(ev) {
if (ev.pageX || ev.pageY) {
return {
x: ev.pageX,
y: ev.pageY
};
}
return {
x: ev.clientX + document.body.scrollLeft - document.body.clientLeft,
y: ev.clientY + document.body.scrollTop - document.body.clientTop
};
}
//弹出方法
function showMessageBox(wTitle, content, pos, wWidth) {
closeWindow();
var bWidth = parseInt(document.documentElement.scrollWidth);
var bHeight = parseInt(document.documentElement.scrollHeight);
if (isIe) {
setSelectState('hidden');
}
var back = document.createElement("div");
back.id = "back";
var styleStr = "top:0px;left:0px;position:absolute;background:#666;width:" + bWidth + "px;height:" + bHeight + "px;";
styleStr += (isIe) ? "filter:alpha(opacity=0);": "opacity:0;";
back.style.cssText = styleStr;
document.body.appendChild(back);
showBackground(back, 50);
var mesW = document.createElement("div");
mesW.id = "mesWindow";
mesW.className = "mesWindow";
mesW.innerHTML = "<div class='mesWindowTop'><table width='100%' height='100%'><tr><td>" + wTitle + "</td><td style='width:1px;'><input type='button' onclick='closeWindow();' title='关闭窗口' class='close' value='关闭' /></td></tr></table></div><div class='mesWindowContent' id='mesWindowContent'>" + content + "</div><div class='mesWindowBottom'></div>";
styleStr = "left:" + (((pos.x - wWidth) > 0) ? (pos.x - wWidth) : pos.x) + "px;top:" + (pos.y) + "px;position:absolute;width:" + wWidth + "px;";
mesW.style.cssText = styleStr;
document.body.appendChild(mesW);
}
//让背景渐渐变暗
function showBackground(obj, endInt) {
if (isIe) {
obj.filters.alpha.opacity += 1;
if (obj.filters.alpha.opacity < endInt) {
setTimeout(function() {
showBackground(obj, endInt)
},
5);
}
} else {
var al = parseFloat(obj.style.opacity);
al += 0.01;
obj.style.opacity = al;
if (al < (endInt / 100)) {
setTimeout(function() {
showBackground(obj, endInt)
},
5);
}
}
}
//关闭窗口
function closeWindow() {
if (document.getElementById('back') != null) {
document.getElementById('back').parentNode.removeChild(document.getElementById('back'));
}
if (document.getElementById('mesWindow') != null)
{
document.getElementById('mesWindow').parentNode.removeChild(document.getElementById('mesWindow'));
}
if (isIe) {
setSelectState('');
}
}
//测试弹出
function testMessageBox(ev)
{
var objPos = mousePosition(ev);
messContent = "<div style='padding:20px 0 20px 0;text-align:center'>消息正文</div>";
showMessageBox('窗口标题', messContent, objPos, 350);
}
</script>
</head>
<body>
<div style="padding:20px">
<div style="text-align:left" ;>
<a href="#none" onclick="testMessageBox(event);">
弹出窗口
</a>
</div>
<div style="text-align:left;padding-left:20px;padding-top:10px" ;>
<select ID="Select1" NAME="Select1">
<option>
下拉
</option>
</select>
弹出窗口时会将其隐藏，关闭时会让其显示，目的是在IE中防止弹出的DIV挡不住下拉框
</div>
<div style="text-align:center" ;>
<a href="#none" onclick="testMessageBox(event);">
弹出窗口
</a>
</div>
<div style="text-align:right" ;>
<a href="#none" onclick="testMessageBox(event);">
弹出窗口
</a>
</div>
</div>
<a href="http://www.goalercn.com">
水平网
</a>
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</body>
</html>