怎么用JS做一个表格的增删改查

我只是复制上面这位同学的代码看看能不能运行<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <meta http-equiv="Content-type" content="text/html; charset=utf-8" /> <title>表格记录增删改查</title> <style type="javaScript"> tr{ text-align:center; } </style> <script type="text/javascript"> //通过新增按钮来控制表格的显示与隐藏 var optionFlag = "save"; var updateRowIndex = -1; var checkFlag=false;//默认为不显示 function show() { optionFlag = "save"; var f = document.getElementById("did");//获得id为did的 div if(!checkFlag) { f.style.visibility="visible"; }else{ f.style.visibility="hidden"; } checkFlag=!checkFlag; } //通过保存按钮将数据添加到表格中 function insertRow_() { switch(optionFlag) { case "save" : insertRow_$save(); break; case "update" : insertRow_$update(); break; default : alert("操作失败！！"); } function insertRow_$save() { //通过id获得要添加数据的表格 var table = document.getElementById("tableid"); //将所输入的内容赋给定义的变量 var titleName = document.getElementById("title").value; var digestName = document.getElementById("digest").value; var authorName = document.getElementById("author").value; //获取下拉框内的内容 var selectIndex_ = document.getElementById("select"); var option = selectIndex_.options[selectIndex_.selectedIndex]; var selectName = option.text; //获取编号的内容 var numberid = table.rows.length; //在表尾添加一行数据 var row_ = table.insertRow(table.rows.length); row_.insertCell(0).innerHTML = numberid; row_.insertCell(1).innerHTML = titleName; row_.insertCell(2).innerHTML = digestName; row_.insertCell(3).innerHTML = authorName; row_.insertCell(4).innerHTML = selectName; row_.insertCell(5).innerHTML = '<input type="button" value="修改" onclick="update_(this.parentNode.parentNode)"></input> <input type="button" value="删除" onclick="delete_(this.parentNode.parentNode)"></input>'; document.getElementById("title").value = ""; document.getElementById("digest").value = ""; document.getElementById("author").value = ""; document.getElementById("select").options[0].selected="true"; var f = document.getElementById("did"); f.style.visibility="hidden"; alert("insert数据成功！！"); } //修改后的保存 var tr; function insertRow_$update() { var table = document.getElementById("tableid"); tr = table.rows[updateRowIndex]; var p = document.getElementById("title"); tr.cells[1].innerHTML = p.value; p = document.getElementById("digest"); tr.cells[2].innerHTML = p.value; p = document.getElementById("author"); tr.cells[3].innerHTML = p.value; p = document.getElementById("select"); var Index_ = p.selectedIndex; var option = p.options[Index_]; var selectName = option.text; tr.cells[4].innerHTML = selectName; document.getElementById("title").value = ""; document.getElementById("digest").value = ""; document.getElementById("author").value = ""; document.getElementById("select").options[0].selected="true"; var f = document.getElementById("did"); f.style.visibility="hidden"; alert("update数据成功！！"); } } //通过删除按钮删除当前所在行 function delete_(row_) { var table = document.getElementById("tableid"); table.deleteRow(row_.rowIndex); refurbish_(); alert("delete数据成功！！"); } //刷新 function refurbish_() { var table = document.getElementById("tableid"); //获得table的行数 var rows = table.rows; for(var i=1;i<rows.length;i++) { rows[i].cells[0].innerHTML = i; } } //通修改按钮对table里的数据进行修改 function update_(row) { updateRowIndex = row.rowIndex; optionFlag = "update"; //对table里的数据进行回显 document.getElementById("title").value = row.cells[1].innerHTML; document.getElementById("digest").value = row.cells[2].innerHTML; document.getElementById("author").value = row.cells[3].innerHTML; var selectText = row.cells[4].innerHTML; var sel = document.getElementById("select"); var ops = sel.options; for(var i=0;i<ops.length;i++) { if(selectText==ops[i].text) { sel.options[i].selected = "true"; } } var f = document.getElementById("did"); f.style.visibility="visible"; } </script> </head> <body> <input type="button" value="新增" onclick="show()"></input> <div> <table border = "1" cellspacing = "0" id="tableid" width="90%"> <tr bgcolor="yellow"> <th>编号</th> <th>名称</th> <th>代码</th> <th>机构</th> <th>类别</th> <th>操作</th> </tr> <tr> <td>1</td> <td>民生宝</td> <td>100021</td> <td>ms</td> <td>基金</td> <td> <input type="button" value="修改" onclick="update_(this.parentNode.parentNode)"></input> <input type="button" value="删除" onclick="delete_(this.parentNode.parentNode)"></input> </td> </tr> </table> </div> <br> <div align="center" id="did" style="visibility:hidden"> <form action=""> <table> <tr> <td>标题：</td> <td><input type="text" id="title"></input></td> <td>摘要：</td> <td><input type="text" id="digest"></input></td> </tr> <tr> <td>作者：</td> <td><input type="text" id="author"></input></td> <td>类别：</td> <td align="left"> <select id="select"> <option>证劵</option> <option>基金</option> <option>股票</option> </select> </td> </tr> </table> <br> <center> <input type="button" value="保存" onclick="insertRow_()"></input> <input type="reset" value="重置"></input> </center> </form> </div> </body> </html>

怎么用JS做一个表格的增删改查

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