H5拖动实现代码

原理以后有空再说现在嘛先上代码。。。。

 *{margin:;}
     html,body {
         width: 100%;
         height: 100%;
         margin:;
     }
     #dragBoxContainer{
         width: 150px;
         padding:10px;
         background:#C1C4E0;
     }
     .dragBox{/* 拖动框 */
         text-align: center;
         background:#FFFFFF;
         border: 1px solid #999999;
         padding: 5px;
         margin: 10px 0;
         cursor: move;
         word-break: break-word;
         position: relative;
     }
     #dragPlaceholder{/* 占位符位 */
         width: 150px;
         height: 33px;
         border:1px dotted red;
     }
     .dragHide{
         /*
         left: -9999px;
         */
         opacity:;
         height:;
         padding:;
         margin:;
     }

 <input type="button" value="添加" id="add">
 <p id="dragthis">拖动元素是：</p>
 <p>
     <span id="dragtarget">目标元素是：</span>
     <span id="dragtarget_Height">目标中间高度：</span>
 </p>
 <p id="mouseHeight">鼠标高度是：</p>
 <p id="Tips_placeholder">占位符位置在：</p>

 <div id="dragBoxContainer"></div>

     var drag_this=null;//当前拖动的元素
     var drag_target=null;//悬停在那个元素
     var DOMnum=0;
     $("#add").click(function add(e){
         DOMnum++;
         $("#dragBoxContainer").append('<div class="dragBox" draggable="true" ondragstart="handleDrag(event)">00'+DOMnum+'</div>');
         var cols = document.querySelectorAll('.dragBox');
         [].forEach.call(cols, addDnDHandlers);
     });
     function handleDrag(e){
         e.dataTransfer.setData("Text"," ");//兼容火狐
     };
     function handleDragStart(e) {//（该方法只会触发一次）拖拽元素开始被拖拽的时候触发的事件，此事件作用在被拖曳元素上
         e = e || window.event;
         var target = e.target || e.srcElement;
         console.log("拖动元素瞬间触发");
         drag_this=target
         console.log(drag_this);
         $("#dragthis").html("拖动元素是："+target.innerHTML);
         //$(target).addClass("dragHide");
     };
     function handleDragEnter(e) {//当拖曳元素进入目标元素的时候触发的事件，此事件作用在目标元素上
         e = e || window.event;
         var target = e.target || e.srcElement;
         console.log("进入目标元素");
         drag_target=target;
         //console.log(target);
         $("#dragtarget").html("目标元素是："+target.innerHTML)
         //$(target).addClass("www");
     };
     function handleDragOver(e) {//拖拽元素正在目标元素上移动的时候触发的事件，此事件作用在目标元素上
         console.log("拖拽元素正在目标元素上移动");
         if (!$(drag_this).hasClass("dragHide")) {
             $(drag_this).addClass("dragHide");
         }
         //console.log({drag_this,drag_target});
         //var this_top=$(drag_this).offset().top;
         var target_top=$(drag_target).offset().top;//目标顶部高度
         var target_height=$(drag_target).height()*.5;//目标高
         //console.log({this_top,target_top});
         //console.log(target_top);
         var mouseHeight=e.pageY;//鼠标Y坐标
         $("#mouseHeight").html("鼠标高度是："+mouseHeight)
         var judgeTop=target_top+target_height;//目标中间高度：
         console.log(target_top,target_height,judgeTop)
         $("#dragtarget_Height").html("目标中间高度："+judgeTop)

         if(mouseHeight<=judgeTop){//上
             var dragPlaceholder=$(drag_target).prev("#dragPlaceholder");
             //console.log(dragPlaceholder)
             if (dragPlaceholder.length==0) {
                 $("#dragPlaceholder").remove();
                 $(drag_target).before('<div id="dragPlaceholder">我是占位符位</div>')
             }
             $("#Tips_placeholder").html("占位符位置在：上")
         }else{//下
             var dragPlaceholder=$(drag_target).next("#dragPlaceholder");
             if (dragPlaceholder.length==0) {
                 $("#dragPlaceholder").remove();
                 $(drag_target).after('<div id="dragPlaceholder">我是占位符位</div>')
             }
             $("#Tips_placeholder").html("占位符位置在：下")
         }
     };
     function handleDragLeave(e) {
         e = e || window.event;
         var target = e.target || e.srcElement;
         console.log("离开目标元素");
     };
     function handleDrop(e) {
         console.log("被拖拽的元素在目标元素上同时鼠标放开触发的事件");
     };
     function handleDragEnd(e) {
         console.log("鼠标释放了");
         e = e || window.event;
         var target = e.target || e.srcElement;
         //console.log(target);

         $("#dragPlaceholder").before(drag_this).remove();
         $(drag_this).removeClass("dragHide");
     };
     function add(e) {
         console.log("点击触发");
     };
     function addDnDHandlers(elem) {
         //elem.addEventListener('drag', handleDrag, false);
         elem.addEventListener('dragstart', handleDragStart, false);
         elem.addEventListener('dragenter', handleDragEnter, false)
         elem.addEventListener('dragover', handleDragOver, false);
         elem.addEventListener('dragleave', handleDragLeave, false);
         elem.addEventListener('drop', handleDrop, false);
         elem.addEventListener('dragend', handleDragEnd, false);
         elem.addEventListener('click', add, false);
     };