原生JS 实现元素排序

 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
 "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
 <html>
 <head>
 <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
 <title></title>
 <style type="text/css">
 *{ margin: 0; padding: 0; -moz-user-select:none;}
 ul{ margin: 100px; border: 1px solid #adff2f; list-style: none;}
 li{ height: 30px; line-height: 30px; padding: 0; list-style: none;}
 li:hover{ background: #bdb76b; cursor: move;}
 </style>
 </head>
 <body>
 <ul id="outer_wrap">
 <li>第一条</li>
 <li>第二条</li>
 <li>第三条</li>
 <li>第四条</li>
 <li>第五条</li>
 <li>第六条</li>
 <li>第七条</li>
 <li>第八条</li>
 </ul>
 <script type="text/javascript">
 function $(id){
 return document.getElementById(id);
 }
 //获取鼠标位置
 function getMousePos(e){
 return {
 x : e.pageX || e.clientX + document.body.scrollLeft,
 y : e.pageY || e.clientY + document.body.scrollTop
 }
 }
 //获取元素位置
 function getElementPos(el){
 return {
 x : el.offsetParent ? el.offsetLeft + arguments.callee(el.offsetParent)['x'] : el.offsetLeft,
 y : el.offsetParent ? el.offsetTop + arguments.callee(el.offsetParent)['y'] : el.offsetTop
 }
 }
 //获取元素尺寸
 function getElementSize(el){
 return {
 width : el.offsetWidth,
 height : el.offsetHeight
 }
 }
 //禁止选择
 document.onselectstart = function(){
 return false;
 }
 //判断是否有挪动
 var MOVE = {};
 MOVE.isMove = false;

 //就是创建的标杆
 var div = document.createElement('div');
 div.style.width = '400px';
 div.style.height = '1px';
 div.style.fontSize = '0';
 div.style.background = 'red';

 var outer_wrap = $('outer_wrap');
 outer_wrap.onmousedown = function(event){
 //获取列表顺序
 var lis = outer_wrap.getElementsByTagName('li');
 for(var i = 0; i < lis.length; i++){
 lis[i]['pos'] = getElementPos(lis[i]);
 lis[i]['size'] = getElementSize(lis[i]);
 }
 event = event || window.event;
 var t = event.target || event.srcElement;
 if(t.tagName.toLowerCase() == 'li'){
 var p = getMousePos(event);
 var el = t.cloneNode(true);
 el.style.position = 'absolute';
 el.style.left = t.pos.x + 'px';
 el.style.top = t.pos.y + 'px';
 el.style.width = t.size.width + 'px';
 el.style.height = t.size.height + 'px';
 el.style.border = '1px solid #d4d4d4';
 el.style.background = '#d4d4d4';
 el.style.opacity = '0.7';
 document.body.appendChild(el);

 document.onmousemove = function(event){
 event = event || window.event;
 var current = getMousePos(event);
 el.style.left =t.pos.x + current.x - p.x + 'px';
 el.style.top =t.pos.y + current.y - p.y+ 'px';
 document.body.style.cursor = 'move';

 //判断插入点
 for(var i = 0; i < lis.length; i++){
 if(current.x > lis[i]['pos']['x'] && current.x < lis[i]['pos']['x'] + lis[i]['size']['width'] && current.y > lis[i]['pos']['y'] && current.y < lis[i]['pos']['y'] + lis[i]['size']['height']/2){
 if(t != lis[i]){
 MOVE.isMove = true;
 outer_wrap.insertBefore(div,lis[i]);
 }

 }else if(current.x > lis[i]['pos']['x'] && current.x < lis[i]['pos']['x'] + lis[i]['size']['width'] && current.y > lis[i]['pos']['y'] + lis[i]['size']['height']/2 && current.y < lis[i]['pos']['y'] + lis[i]['size']['height']){
 if(t != lis[i]){
 MOVE.isMove = true;
 outer_wrap.insertBefore(div,lis[i].nextSibling);
 }
 }
 }
 }
 //移除事件
 document.onmouseup = function(event){
 event = event || window.event;
 document.onmousemove = null;
 if(MOVE.isMove){
 outer_wrap.replaceChild(t,div);
 MOVE.isMove = false;
 }
 document.body.removeChild(el);
 el = null;
 document.body.style.cursor = 'normal';
 document.onmouseup = null;
 }
 }
 }
 </script>
 </body>
 </html>