var html = "<div style=‘color:red‘>这是测试的弹窗</div>";
var button ="<input type=‘button‘ value=http://www.mamicode.com/‘确定‘ />";
var win = new Window({
   width : 500, //宽度
   height : 400, //高度
   title : ‘测试弹窗‘, //标题
   content : html, //内容
   isMask : false, //是否遮罩
   buttons : button, //按钮
   isDrag:true, //是否移动
});


JS：

// 每个弹窗的标识
var x =0;
var idzt = new Array();
var Window = function(config){
   
   //ID不重复
   idzt[x] = "zhuti"+x;  //弹窗ID
   
   //初始化，接收参数 || 前面表示有默认值，后面为空就为默认值
   this.config = {
      width : config.width || 300, //宽度
      height : config.height || 200, //高度
      buttons : config.buttons || ‘‘, //默认无按钮
      title : config.title || ‘标题‘, //标题
      content : config.content || ‘内容‘, //内容
      isMask : config.isMask == false?false:config.isMask || true, //是否遮罩
      isDrag : config.isDrag == false?false:config.isDrag || true, //是否移动
      };
   
   //加载弹出窗口
   var w = ($(window).width()-this.config.width)/2;
   var h = ($(window).height()-this.config.height)/2;
   
   var nr = "<div class=‘zhuti‘ id=‘"+idzt[x]+"‘ bs=‘"+x+"‘ style=‘width:"+this.config.width+"px; height:"+this.config.height+"px;  left:"+w+"px; top:"+0+"px; ‘></div>";
   $("body").append(nr);
   
   //加载弹窗标题
   var content ="<div id=‘title"+x+"‘ class=‘title‘ bs=‘"+x+"‘>"+this.config.title+"<div id=‘close"+x+"‘ class=‘close‘ bs=‘"+x+"‘>×</div></div>";
   //加载弹窗内容
   var nrh = this.config.height - 85;
   content = content+"<div id=‘content"+x+"‘ bs=‘"+x+"‘ class=‘content‘ style=‘width:100%; height:"+nrh+"px;‘>"+this.config.content+"</div>";
   //加载按钮
   content = content+"<div id=‘btnx"+x+"‘ bs=‘"+x+"‘ class=‘btnx‘>"+this.config.buttons+"</div>";
   
   //将标题、内容及按钮添加进窗口
   $(‘#‘+idzt[x]).html(content);
   
   //创建遮罩层
   if(this.config.isMask)
   {
      var zz = "<div id=‘zz‘></div>";
      $("body").append(zz);
      $("#zz").css(‘display‘,‘block‘);
   }
   
   //最大最小限制，以免移动到页面外
   var maxX = $(window).width()-this.config.width;
   var maxY = $(window).height()-this.config.height;
   var minX = 0,
      minY = 0;
   
   //窗口移动
   if(this.config.isDrag)
   {
      //鼠标移动弹出窗
      $(".title").bind("mousedown",function(e){
            
            var n = this.getAttribute("bs"); //取标识
            
            //使选中的到最上层
            $(".zhuti").css("z-index",3);
            $(‘#‘+idzt[n]).css("z-index",4);
            
            //取初始坐标
            var endX = 0, //移动后X坐标
               endY = 0, //移动后Y坐标
               startX = parseInt($(‘#‘+idzt[n]).css("left")), //弹出层的初始X坐标
               startY = parseInt($(‘#‘+idzt[n]).css("top")), //弹出层的初始Y坐标
               downX = e.clientX, //鼠标按下时，鼠标的X坐标
               downY = e.clientY; //鼠标按下时，鼠标的Y坐标
               
            //绑定鼠标移动事件
            $("body").bind("mousemove",function(es){
               
               endX = es.clientX - downX + startX; //X坐标移动
               endY = es.clientY - downY + startY; //Y坐标移动
               
               //最大最小限制
               if(endX > maxX)
               {
                  endX = maxX;
               } else if(endX < 0)
               {
                  endX = 0;
               }
               if(endY > maxY)
               {
                  endY = maxY;
               } else if(endY < 0)
               {
                  endY = 0;
               }
               
               $(‘#‘+idzt[n]).css("top",endY+"px");
               $(‘#‘+idzt[n]).css("left",endX+"px");
               
               window.getSelection ? window.getSelection().removeAllRanges():document.selection.empty(); //取消选中文本
               
               });
         });
      //鼠标按键抬起，释放移动事件
      $("body").bind("mouseup",function(){
         
            $("body").unbind("mousemove");
         
         });
   }
   
   //关闭窗口
   $(".close").click(function(){
         var m = this.getAttribute("bs"); //找标识
         $(‘#‘+idzt[m]).remove(); //移除弹窗
         $(‘#zz‘).remove(); //移除遮罩 
      
      })
      x++;  //标识增加
}



CSS:

.zhuti
{
   position:absolute;
   z-index:3;
   font-size:14px;
   border-radius:5px;
   box-shadow:0 0 5px white;
   overflow:hidden;
   color:#333;
}
.title
{
   background-color:#E9E9E9;
   vertical-align:middle;
   height:25px;
   width:100%;
   line-height:25px;
   text-indent:1em;
   text-align: center;
   color: rgba(104, 104, 104, 0.98);
   font-size: 14px;
   font-family: "Microsoft YaHei", sans-serif;
}
.close{
   float:right;
   width:35px;
   height:25px;
   font-weight:bold;
   line-height:25px;
   vertical-align:middle;
   color:white;
   font-size:18px;
   }
.close:hover
{
   cursor:pointer;
}
.content
{
   text-indent:1em;
   padding-top:20px;
   border-bottom: 1px solid #dfe4e2;
}
.btnx
{
   height:30px;
   width:100%;
   text-indent:1em;
   margin-top: 7px;
}
.btn
{
   height:28px;
   width:80px;
   float:left;
   margin-left:20px;
   color:#333;
}
#zz
{
   width:100%;
   height:100%;
   opacity:0.5;
   display:none;
   background-color: #c6cee8;
   z-index:2;
   position:absolute;
   top:0px;
   left:0px;
}

js弹窗