jQuery窗口拖动功能的实现代码

 $("#showTitle").mousedown(function (e) {
    vbool = true;
    vHeight = e.pageY;
    vWidth = e.pageX;
    cHeight = vHeight - $("#show").offset().top;
    cWdith = vWidth - $("#show").offset().left;
    //alert("divshow" + $("#show").offset().top + " divvHeight" + vHeight);
    //alert("高" + cHeight + " 宽" + cWdith);
  })
  $(document).mouseup(function () {
    vbool = false;
  })
  var showWidth = $("#show").width();
  var showHeight = $("#show").height();
  var documentWidth = $(document).width();
  var documentHeight = $(document).height();
  $(document).mousemove(function (e) {
    if (vbool) {
      var divheight = e.pageY - cHeight;//窗口要移动到的位置
      var divwidth = e.pageX - cWdith;//窗口要移动到的位置
      $("#la1").text(divheight + "w" + divwidth + "win" + showWidth + " x " + documentWidth + "" + showWidth);
      if (divwidth < 0) {
        divwidth = 0;
      }
      if (divheight < 50) {
        divheight = 50;
      }
      if (divwidth > documentWidth - showWidth) {
        divwidth = documentWidth - showWidth - 5;
      }
      if (divheight > documentHeight - showHeight) {
        divheight = documentHeight - showHeight - 5;
      }
      $("#show").css({ "left": divwidth, "top": divheight });
    }
  })

// 弹窗模块拖拽拖动
$(function(){
  var _move=false;//移动标记
  var _x,_y;//鼠标离控件左上角的相对位置
  var _dragZone = $(".M_boxCenter .M_boxBody > h3");
  var _dragBody = _dragZone.parent();
  _dragZone.mousedown(function(e){
    $(this).attr("onselectstart", "return false"); //禁双击选中
    $("body").css({"-webkit-user-select":"none", "-moz-user-select":"none", "-ms-user-select":"none", "-khtml-user-select":"none", "user-select":"none"}); //禁止选中文字
    _move=true;
    _x=e.pageX-parseInt(_dragBody.css("margin-left"));
    _y=e.pageY-parseInt(_dragBody.css("margin-top"));
    _dragBody.fadeTo(150, 0.5);
  });
  $(document).mousemove(function(e){
    if(_move){
      var x=e.pageX-_x;//移动时根据鼠标位置计算控件左上角的绝对位置
      var y=e.pageY-_y;
      if(e.pageX <= 0 || e.pageY <= 0){
        _move=false;
      }else {
        _dragBody.css({marginLeft:x, marginTop:y});//控件新位置
      }
    }
  }).mouseup(function(){
    _move=false;
    _dragBody.fadeTo("fast", 1);
    $("body").removeAttr("style"); //移除不能选文字
  });
});