<script type="text/javascript">
var otest = document.getElementById("test");
var newnode = document.createElement("li");
newnode.innerHTML = "PHP";
otest.appendChild(newnode);
</script>
为什么非要写 var newnode = document.createElement("li");而不能写成： var newnode = otest.createElement("li");????我在这个对象下面创建一个li节点不行么？
2016-05-09
<style type="text/css">
table{
border: 1px solid #000000;
}
table th{
border: 1px solid red;
}
table td{
border: 1px solid blue;
}
</style>
</head>
<body>
<table style="border: 1px solid #000000">
<tbody>
<tr style="">
<th>列1</th>
<th>列2</th>
<th>列3</th>
<th>列4</th>
<th>列5</th>
<th>列6</th>
<th>menu</th>
</tr>
<tr>
<td>列1</td>
<td>列2</td>
<td>列3</td>
<td>列4</td>
<td>列5</td>
<td>列6</td>
<td>
<input type="button" name="add" value="新增" onclick="addrow(this,1)" />
<input type="button" name="del" value="删除" onclick="adelrow(this,1)" />
</td>
</tr>
<tr>
<td>列11</td>
<td>列12</td>
<td>列13</td>
<td>列14</td>
<td>列15</td>
<td>列16</td>
<td>
<input type="button" name="add" value="新增" onclick="addrow(this,2)" />
<input type="button" name="del" value="删除" onclick="adelrow(this,2)" />
</td>
</tr>
<tr>
<td>列21</td>
<td>列22</td>
<td>列23</td>
<td>列24</td>
<td>列25</td>
<td>列26</td>
<td>
<input type="button" name="add" value="新增" onclick="addrow(this,3)" />
<input type="button" name="del" value="删除" onclick="adelrow(this,3)" />
</td>
</tr>
<tr>
<td>列31</td>
<td>列32</td>
<td>列33</td>
<td>列34</td>
<td>列35</td>
<td>列36</td>
<td>
<input type="button" name="add" value="新增" onclick="addrow(this,4)" />
<input type="button" name="del" value="删除" onclick="adelrow(this,4)" />
</td>
</tr>
</tbody>
</table>
</body>
</html>
<script type="text/javascript">
function addrow(obj,num){
var tab =obj.parentNode.parentNode.parentNode;
var trNum = document.getElementsByTagName ("tr").length;
var row=document.createElement ("tr");
for(var j=1;j<8;j++){
var cell=document.createElement ("td");
cell.id =trNum+1+"/"+j;
if(j==7){
var inputadd = createAddBtn('addrow');
var inputdel = createAddBtn('adelrow');
cell.appendChild(inputadd);
cell.appendChild(inputdel);
}
else{
cell.appendChild(document.createTextNode ("第"+cell.id+"列"));
}
row.appendChild (cell);
}
console.log(tab,obj,num,arguments);
tab.appendChild (row);
}
function adelrow(obj){
var tabbody =obj.parentNode.parentNode.parentNode;
var tr =obj.parentNode.parentNode;
console.log(tabbody,tr,obj,arguments);
tabbody.removeChild(tr);
}
function createAddBtn(fucname)
{
var input = document.createElement('input');
input.type = "button";
if(fucname == 'addrow')
input.value = "新增";
else
input.value = "删除";
//input.onclick = fucname+"(this)";
input.setAttribute("onclick", fucname+"(this,0)");
return input;
}
</script>
求分析这些代码！！！！感激不尽！！！！
举报
