Question

html javascript 怎么判断<td></td>是空的？

就想判断 <td id="pp1"></td> 是否为空，如果为空就添加内容，不为空就查看下一个<td id="pp1"></td>
以下是代码，这样写不知道哪里错了？？？
<table width="100%" class="bg_6">
<tr>
<td id="pp1" width="25%">等等等等</td>
<td id="pp2" width="25%"></td>
</tr>
<tr>
<td id="pp3" width="25%"></td>
<td id="pp4" width="25%"></td>
</tr>
</table>
<div class="ub uinn-at1">
<input class="" type="button" value="发布" onclick="tdnull()"/>
</div>
<script>
function tdnull() {
var pp1= document.getElementById("pp1");
if (pp1.value.length == 0) {
alert("为空");
} else {
alert("有东西");
}
}
</script>

Answer 1

td没有value这个属性，用innerText

Answer 2

<script type="text/javascript">
window.onload = function(){
alert("ready");
var tds = document.getElementsByTagName('td');
for(var i = 0;i<tds.length;i++){
if(tds[i].innerHTML == "" || tds[i].innerText == "") {
tds[i].innerHTML = "添加内容";
}
}
}
</script>