<div class="divWrap" id="move1" style="width: 200px; height: 200px; background: Green; border: 1px solid red; position: absolute; top: 100px; left: 100px; cursor: move; -moz-user-select: none; -webkit-user-select: none;"></div>
<div class="divWrap" style="width: 200px; height: 200px; background: brown; border: 1px solid red; position: absolute; top: 300px; left: 100px;">
  <h3 id="move2" style="height: 45px; line-height: 45px; font-size: 18px; background: red; margin: 0; cursor: move; -moz-user-select: none; -webkit-user-select: none;">Title--Move</h3>
</div>

(function($) {
  $.fn.dragDiv = function(divWrap) {
    return this.each(function() {
      var $divMove = $(this);//鼠標可拖拽區(qū)域
      var $divWrap = divWrap ? $divMove.parents(divWrap) : $divMove;//整個移動區(qū)域
      var mX = 0, mY = 0;//定義鼠標X軸Y軸
      var dX = 0, dY = 0;//定義div左、上位置
      var isDown = false;//mousedown標記
      if(document.attachEvent) {//ie的事件監(jiān)聽，拖拽div時禁止選中內容，firefox與chrome已在css中設置過-moz-user-select: none; -webkit-user-select: none;
        $divMove[0].attachEvent('onselectstart', function() {
          return false;
        });
      }
      $divMove.mousedown(function(event) {
        var event = event || window.event;
        mX = event.clientX;
        mY = event.clientY;
        dX = $divWrap.offset().left;
        dY = $divWrap.offset().top;
        isDown = true;//鼠標拖拽啟動
      });
      $(document).mousemove(function(event) {
        var event = event || window.event;
        var x = event.clientX;//鼠標滑動時的X軸
        var y = event.clientY;//鼠標滑動時的Y軸
        if(isDown) {
          $divWrap.css({"left": x - mX + dX, "top": y - mY + dY});//div動態(tài)位置賦值
        }
      });
      $divMove.mouseup(function() {
        isDown = false;//鼠標拖拽結束
      });
    });
  };
})(jQuery);
//
$(document).ready(function() {
  $("#move1").dragDiv();//拖拽整個div
  $("#move2").dragDiv(".divWrap");//拖拽div頭部
});