js操作table，实现拖拽，保存顺序思路
<%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8"%><html><HEAD><META http-equiv="Content-Type" content="text/html; charset=utf-8"><TITLE>拖动</TITLE><STYLE>td {width: 20%;height: 20px;border-bottom: 1px solid black;border-right: 1px solid black;cursor: default;}div {font-size: 13px;}th {height: 20px;font-size: 12px;font-weight: normal;border-bottom: 2px solid black;background-color: #CCCCCC}table {border: 1px solid black;font-size: 13px;}</STYLE><script language="javascript">/************************************ dragedTableData.js *******************************//************************************ dragedTableData.js *******************************//** created by chengRenYin 2004.4.12* 可以实现表格内容的内部拖动* 确保中间过度层的存在，id为指定*//*--------全局变量-----------*/var dragedTable_x0,dragedTable_y0,dragedTable_x1,dragedTable_y1;var dragedTable_movable = false;var dragedTable_preCell = null;var dragedTable_normalColor = null;//起始单元格的颜色var dragedTable_preColor = "lavender";//目标单元格的颜色var dragedTable_endColor = "#FFCCFF";var dragedTable_movedDiv = "dragedTable_movedDiv";var dragedTable_tableId = "";/*--------全局变量-----------*/function DragedTable(tableId){dragedTable_tableId = tableId;var oTempDiv = document.createElement("div");oTempDiv.id = dragedTable_movedDiv;oTempDiv.onselectstart = function(){return false};oTempDiv.style.cursor = "hand";oTempDiv.style.position = "absolute";oTempDiv.style.border = "1px solid black";oTempDiv.style.backgroundColor = dragedTable_endColor;oTempDiv.style.display = "none";document.body.appendChild(oTempDiv);document.all(tableId).onmousedown = showDiv;}//得到控件的绝对位置function getPos(cell){var pos = new Array();var t=cell.offsetTop;var l=cell.offsetLeft;while(cell=cell.offsetParent){t+=cell.offsetTop;l+=cell.offsetLeft;}pos[0] = t;pos[1] = l;return pos;}//显示图层function showDiv(){var obj = event.srcElement;var pos = new Array();//获取过度图层var oDiv = document.all(dragedTable_movedDiv);if(obj.tagName.toLowerCase() == "td"){obj.style.cursor = "hand";pos = getPos(obj);//计算中间过度层位置，赋值oDiv.style.width = obj.offsetWidth;oDiv.style.height = obj.offsetHeight;oDiv.style.top = pos[0];oDiv.style.left = pos[1];oDiv.innerHTML = obj.innerHTML;oDiv.style.display = "";dragedTable_x0 = pos[1];dragedTable_y0 = pos[0];dragedTable_x1 = event.clientX;dragedTable_y1 = event.clientY;//记住原tddragedTable_normalColor = obj.style.backgroundColor;obj.style.backgroundColor = dragedTable_preColor;dragedTable_preCell = obj;dragedTable_movable = true;}}function dragDiv(){if(dragedTable_movable){var oDiv = document.all(dragedTable_movedDiv);var pos = new Array();oDiv.style.top = event.clientY - dragedTable_y1 + dragedTable_y0;oDiv.style.left = event.clientX - dragedTable_x1 + dragedTable_x0;var oTable = document.all(dragedTable_tableId);for(var i=0; i<oTable.cells.length; i++){if(oTable.cells[i].tagName.toLowerCase() == "td"){pos = getPos(oTable.cells[i]);if(event.x>pos[1]&&event.x<pos[1]+oTable.cells[i].offsetWidth&& event.y>pos[0]&& event.y<pos[0]+oTable.cells[i].offsetHeight){if(oTable.cells[i] != dragedTable_preCell)oTable.cells[i].style.backgroundColor = dragedTable_endColor;}else{if(oTable.cells[i] != dragedTable_preCell)oTable.cells[i].style.backgroundColor = dragedTable_normalColor;}}}}}function hideDiv(){if(dragedTable_movable){var oTable = document.all(dragedTable_tableId);var pos = new Array();if(dragedTable_preCell != null){for(var i=0; i<oTable.cells.length; i++){pos = getPos(oTable.cells[i]);//计算鼠标位置，是否在某个单元格的范围之内if(event.x>pos[1]&&event.x<pos[1]+oTable.cells[i].offsetWidth&& event.y>pos[0]&& event.y<pos[0]+oTable.cells[i].offsetHeight){if(oTable.cells[i].tagName.toLowerCase() == "td"){//交换文本dragedTable_preCell.innerHTML = oTable.cells[i].innerHTML;oTable.cells[i].innerHTML = document.all(dragedTable_movedDiv).innerHTML;//清除原单元格和目标单元格的样式dragedTable_preCell.style.backgroundColor = dragedTable_normalColor;oTable.cells[i].style.backgroundColor = dragedTable_normalColor;oTable.cells[i].style.cursor = "";dragedTable_preCell.style.cursor = "";dragedTable_preCell.style.backgroundColor = dragedTable_normalColor;}}}}dragedTable_movable = false;//清除提示图层document.all(dragedTable_movedDiv).style.display = "none";}}document.onmouseup = function(){hideDiv();var oTable = document.all(dragedTable_tableId);for(var i=0; i<oTable.cells.length; i++)oTable.cells[i].style.backgroundColor = dragedTable_normalColor;}document.onmousemove = function(){dragDiv();}/************************************ dragedTableData.js 结束 *******************************//************************************ dragedTableData.js 结束 *******************************/</script><script language="javascript">function init(){//注册可拖拽表格new DragedTable("tableId");}function save(){var table = document.getElementById('tableId');var rows = table.rows;for(var i=0;i<rows.length;i++){var cells = table.rows[i].cells;for(var j=0;j<cells.length;j++){alert(cells[j].innerHTML)}}}</script></HEAD><BODY oncontextmenu="return false;" onload="init()"><TABLE id="tableId" width="70%" align="center" cellpadding="0" cellspacing="0"><%for(int i=1;i<=10;i++){%><% if(i%4==0){ %><td><%=Math.round(i*Math.random()) %></td><% }else{ %><td><%=Math.round(i*Math.random()) %></td><%} %><% if(i%4==0){ %></tr><%} %><%} %></TABLE><TABLE id="tableIdTEST" width="70%" align="center" cellpadding="0" cellspacing="0"><tr><TH colspan="4" style=""><input type="button" id="sub" name="subName" value="save" onclick="save()"/></TH></tr></TABLE></BODY></HTML>