HTML code:
<html>
<head>
<script language="javascript" type="text/javascript">
alert(document.getElementById("member").options.length)
</script>
</head>
<body>
<select id="member">
<option value="1"></option>
</select>
</body>
</html>
代码报错alert那一句缺少对象是为什么啊？
<script language="javascript" type="text/javascript">
alert(document.getElementById("member").options.length)
//在解析上面这行代码时member的元素还有加载进来
</script>
<html>
<head>
<script type="text/javascript">
function test()
{
alert(document.getElementById("member").length);
}
</script>
</head>
<body>
<select id="member">
<option>123 </option>
</select>
<input type="submit" onclick="test()" value="show" />
</body>
</html>
试试
window.onload = function(){alert(document.getElementById("member").options.length);}
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问题内容：判断顺序号列及子序号列必须为数字。
<td><div align="center"><input type="text" name="xuHao${g+1}" class="inputW" value="& ......
