javascript点击弹出可以关闭带有灰色背景弹出层
分类：实例代码
本章节分享一段代码实例，它实现了点击弹出一个带有灰色背景的弹出层效果。
并且此层带有关闭按钮，由于代码比较长且比较简单，所以这里就不做分析了，需要的自行参考一下。
代码实例如下:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="author" content="http://www.pipipi.net/" />
<title>前端教程网</title>
<script>
function alertWin(title, msg, w, h){
var titleheight = "23px"; // 窗口标题高度
var bordercolor = "#336699"; // 提示窗口的边框颜色
var titlecolor = "#FFFFFF"; // 窗口标题颜色
var titlebgcolor = "#336699"; // 窗口标题背景色
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");
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;
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;
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;
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Event对象，用于兼容IE和FireFox
function getEvent() {
return window.event || arguments.callee.caller.arguments[0];
}
}
window.onload=function(){
var obt=document.getElementById("bt");
obt.onclick=function(){
alertWin('点击弹出可关闭的层窗口，网页变灰',290,208);
}
}
</script>
</head>
<body>
<input type="button" id="bt" value="点这里"/>
</body>
</html>