js实现弹出灰色背景能够拖动的窗口实例代码

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带有灰色半透明的弹出框效果非常常见，比如登陆窗口或者注册窗口，有些是可以拖动的，有些是不可拖动的，非常的人性化，基本属于前端必须要掌握的功能代码，下面是一段这样的代码实例，供大家参考一下。

代码实例如下:

[ 其他 ] 运行代码下载代码

<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta name="author" content="http://www.51qianduan.com/" />
<title>弹出层代码实例</title> 
<script type="text/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");
  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;
  function getEvent() 
  {
    return window.event || arguments.callee.caller.arguments[0];
  }
} 
</script>
</head>
<body>
<input type="button" value="点这里" onclick="alertWin('标题','51前端欢迎您',300,200);" />
</body>
</html>

代码描述：js 弹出灰色背景拖动窗口。js实现弹出灰色背景能够拖动的窗口实例代码

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