拖动层效果(消息框)

/********************拖动层效果*********************/ 

//可以打包为js文件;
var x0=0,y0=0,x1=0,y1=0;
var offx=6,offy=6;
var moveable=false;
var hover='orange',normal='#979D8B';//color;slategray
var index=10000;//z-index;
//开始拖动;
function startDrag(obj)
{
//锁定标题栏;
obj.setCapture();
//定义对象;
var win = obj.parentNode;
var sha = win.nextSibling;
//记录鼠标和层位置;
x0 = event.clientX;
y0 = event.clientY;
x1 = parseInt(win.style.left);
y1 = parseInt(win.style.top);
//记录颜色;
normal = obj.style.backgroundColor;
//改变风格;
obj.style.backgroundColor = hover;
win.style.borderColor = hover;
obj.nextSibling.style.color = hover;
sha.style.left = x1 + offx;
sha.style.top = y1 + offy;
moveable = true;
}
//拖动;
function drag(obj)
{
var win = obj.parentNode;
var sha = win.nextSibling;
if(moveable)
{
 win.style.left = x1 + event.clientX - x0;
 win.style.top = y1 + event.clientY - y0;
 sha.style.left = parseInt(win.style.left) + offx;
 sha.style.top = parseInt(win.style.top) + offy;
}
}
//停止拖动;
function stopDrag(obj)
{
var win = obj.parentNode;
var sha = win.nextSibling;
win.style.borderColor = normal;
obj.style.backgroundColor = normal;
obj.nextSibling.style.color = normal;
sha.style.left = obj.parentNode.style.left;
sha.style.top = obj.parentNode.style.top;
//放开标题栏;
obj.releaseCapture();
moveable = false;
}
//获得焦点;
function getFocus(obj)
{
index = index + 2;
var idx = index;
obj.style.zIndex=idx;
obj.nextSibling.style.zIndex=idx-1;
}
function min(obj)
{
var win = obj.parentNode.parentNode;
var sha = win.nextSibling;
var tit = obj.parentNode;
var msg = tit.nextSibling;
var flg = msg.style.display=="none";
if(flg)
{
 win.style.height = parseInt(msg.style.height) + parseInt(tit.style.height) + 2*2;
 sha.style.height = win.style.height;
 msg.style.display = "block";
 obj.innerHTML = "0";
}
else
{
 win.style.height = parseInt(tit.style.height) + 2*2;
 sha.style.height = win.style.height;
 obj.innerHTML = "2";
 msg.style.display = "none";
}
}
function cls(obj)
{
var win = obj.parentNode.parentNode;
var sha = win.nextSibling;
win.style.visibility = "hidden";
sha.style.visibility = "hidden";
}
//创建一个对象;
function xWin(id,w,h,l,t,tit,msg)
{
index = index+2;
this.id   = id;
this.width  = w;
this.height = h;
this.left  = l;
this.top   = t;
this.zIndex = index;
this.title  = tit;
this.message = msg;
this.obj   = null;
this.bulid  = bulid;
this.bulid();
}
//初始化;
function bulid()
{
var str = ""
 + "<div id=xMsg" + this.id + " "
 + "style='"
 + "z-index:" + this.zIndex + ";"
 + "width:" + this.width + ";"
 + "height:" + this.height + ";"
 + "left:" + this.left + ";"
 + "top:" + this.top + ";"
 + "background-color:" + normal + ";"
 + "color:" + normal + ";"
 + "font-size:12px;"
 + "font-family:Verdana;"
 + "position:absolute;"
 + "cursor:default;"
 + "border:2px solid " + normal + ";"
 + "' "
 + "onmousedown='getFocus(this)'>"
  + "<div "
  + "style='"
  + "background-color:" + normal + ";"
  + "width:" + (this.width-2*2) + ";"
  + "height:20;"
  + "color:white;"
  + "' "
  + "onmousedown='startDrag(this)' "
  + "onmouseup='stopDrag(this)' "
  + "onmousemove='drag(this)' "
  + ">"
  + "<span style='width:" + (this.width-2*12-4) + ";padding-left:3px;'>" + this.title + "</span>"
  + "<span style='width:12;border-width:0px;color:white;font-family:webdings;' onclick='min(this)'>0</span>"
  + "<span style='width:12;border-width:0px;color:white;font-family:webdings;' onclick='cls(this)'>r</span>"
  + "</div>"
  + "<div style='"
  + "width:100%;"
  + "height:" + (this.height-20-4) + ";"
  + "background-color:white;"
  + "line-height:14px;"
  + "word-break:break-all;"
  + "padding:3px;"
  + "'>" + this.message + "</div>"
 + "</div>"
 + "<div style='"
 + "width:" + this.width + ";"
 + "height:" + this.height + ";"
 + "top:" + this.top + ";"
 + "left:" + this.left + ";"
 + "z-index:" + (this.zIndex-1) + ";"
 + "position:absolute;"
 + "background-color:black;"
 + "filter:alpha(opacity=40);"
 + "'>?</div>";
 //alert(str);
document.body.insertAdjacentHTML("beforeEnd",str);
}

/********************拖动层效果 end*********************/  

//移除层(removeNode,不然会留下DIV占位）
function div_Remove(div_name){
    var win = document.getElementById("xMsg"+div_name);
    var sha = win.nextSibling;
    win.removeNode(true);
    sha.removeNode(true);  
}

function xWin(id,w,h,l,t,tit,msg)

 使用方法：
  new xWin("Info",400,120,140,50,"标题","内容（可以自己构造table）");
 参数说明:
id:层的ID,实际为xMsg加上传进去的值:如msgInfo
w:width
h:height
l:left
t:top
tit:title
msg:message

移除层可以用
div_Remove(div_name)

跟上new xWin中的ID

//移除层(removeNode,不然会留下DIV占位）
function div_Remove(div_name){
    var win = document.getElementById("xMsg"+div_name);
    var sha = win.nextSibling;
    win.removeNode(true);
    sha.removeNode(true);  
}