<script type="text/javascript">
function cheng()
{
if(document.getElementById("usr").value=="")
document.getElementById("sec").style.color = "#ff0000";
}
</script><table id="td">
<tr>
<th id="sec">第一头</th>
<th>第二头</th>
</tr>
<tr>
<td>
<input type="text" id="usr">
</td>
<td>
<input type="button" value="check" onclick="cheng();">
</td></tr>
</table>
<html>
<head>
<title>aaaa</title>
</head>
<body>
<script type="text/javascript">
function cheng(obj)
{
var input = getFirstChild(get_previoussibling(obj.parentNode));
if(input.value=="")
document.getElementById("sec").style.color = "#ff0000";
}
function get_previoussibling(n)
{
var x=n.previousSibling;
if(x == null) return null;
while (x && x.nodeType!=1)
{
x=x.previousSibling;
}
return x;
} function getFirstChild(obj){
for (i=0; i<obj.childNodes.length; i++){
if (obj.childNodes[i].nodeType==1)
return obj.childNodes[i];
else
continue;
}
}
</script> <table id="td">
<tr>
<th id="sec">第一头</th>
<th>第二头</th>
</tr>
<tr>
<td>
<input type="text" name="usr">
</td>
<td>
<input type="button" value="check" onclick="cheng(this);">
</td> </tr>
</table>
</body>
</html>
document.getElementById("sec").style.color = "#ff0000";
{
if(document.getElementsByName("usr")[0].value=="")
document.getElementById("sec").style.color = "#ff0000";
}
function cheng() {
if (document.getElementsByName("usr")[0].value == "") {
document.getElementById("sec").style.color = "#ff0000";
}
}
</script>
alert(obj.parentNode.previousSibling.nodeName);
}打印出来的是#text,我视图打印文本节点的nodeValue来,但是怎么都是没有,这是为什么?
<div id="n2" name="n2"></div>
<input type="text" name="n3"/>
<script type="text/javascript">
function testMain(){
var names[]=document.getElementsByName("n3");
alert("ss");
/*
for(var i=0;i<names.length;i++){
alert(names[i]);
}
for(var x in names){
alert(x);
}*/
}
window.onload=testMain;
</script>
document.getElementsByName这个方法我用IE,chrome,firefox上试过,好像不能用,当我把var names[]=document.getElementsByName("n3");注释掉后,才能弹出ss,我在网站上看到有人说可以用,不知道我为什用不了