javascript 弹出层输入框的实现代码

<script language="javascript" type="text/javascript">
/**
* 弹出层输入框的示例
* by www.jb200.com
*/
function alertWin(title, msg, w, h) {
    var titleheight = "22px"; // 窗口标题高度
    var bordercolor = "#666699"; //窗口的边框颜色
    var titlecolor = "#FFFFFF"; // 窗口的标题颜色
    var titlebgcolor = "#666699"; // 窗口的标题背景色
    var bgcolor = "#FFFFFF"; // 内容背景色
    var iWidth = document.documentElement.clientWidth; //这个窗口的宽度
    var iHeight = document.documentElement.clientHeight; //这个窗口的高度

    //背景层的格式
    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:1000;";

    document.body.appendChild(bgObj);

    var iframe2 = document.createElement("iframe");
    iframe2.style.cssText = "position:absolute; top:0px;filter:Alpha(Opacity=30);opacity:0.3;background-color:#000000; z-index:1001; border-style:none; border-width:0px; border:0px;width:" + iWidth + "px;height:" + iHeight + "px";
    bgObj.appendChild(iframe2);

    //创建一个弹出层
    var msgObj = document.createElement("div");
    //设置弹出的层的样式
    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:1001;";
    document.body.appendChild(msgObj);
    //创建一个table用于容纳层上的内容
    var table = document.createElement("table");
    //将Table放到弹出层上
    msgObj.appendChild(table);
    //设置table的格式
    table.style.cssText = "margin:0px;border:0px;padding:0px;";
    table.cellSpacing = 0;
    //插入一行用于显示标题
    var tr = table.insertRow(-1);
    //插入一个单元格用于容纳标题
    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";
    //设置标题
    titleBar.innerHTML = title;
    //设置曾德拖动事件
    var moveX = 0;
    var moveY = 0;
    var moveTop = 0;
    var moveLeft = 0;
    var moveable = false;
    var docMouseMoveEvent = document.onmousemove;
    var docMouseUpEvent = document.onmouseup;
    //鼠标点击标题
    titleBar.onmousedown = function() {
var evt = getEvent();
moveable = true;
moveX = evt.clientX;
moveY = evt.clientY;
moveTop = parseInt(msgObj.style.top);
moveLeft = parseInt(msgObj.style.left);
//鼠标拖动
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;
    }
};
    }

    //关闭按钮事件
    var closeBtn = tr.insertCell(-1);
    closeBtn.style.cssText = "cursor:pointer; text-align:right;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);
    }

    //弹出的消息窗口内容
    var msgBox = table.insertRow(-1).insertCell(-1);
    msgBox.style.cssText = "font:10pt '宋体';";
    msgBox.colSpan = 2;
    msgBox.innerHTML = msg;
    //层上模板名称的内容 www.jb200.com
    var nameBox = table.insertRow(-1);
    var nameLable = nameBox.insertCell(-1);
    nameLable.style.cssText = "font:12pt '宋体';text-align:center;";
    nameLable.innerHTML = "<br/>输入身份证号：<br/>";
    var nametext = nameBox.insertCell(-1);
    nametext.style.cssText = "font:12pt '宋体';text-align:Left; margin-left:0px";
    nametext.innerHTML = "<br/><input type='text' value='' id='modalName'/>   <br/>";
    //层上动作按钮的内容
    var submitBox = table.insertRow(-1);
    var submitBtn = submitBox.insertCell(-1);
    submitBtn.style.cssText = "text-align:center;";
    submitBtn.colSpan = 2;
    submitBtn.innerHTML = "<br/><input type='Button' value='确 定' id='saveHeader'onclick='return GetCark()' /><br/>";
    function getEvent() {
return window.event || arguments.callee.caller.arguments[0];
    }
}
    </script>
<input type="button" value="存储表头" onclick="alertWin('身份信息采集','',300,150);" />