提交表单时数据检测

一、表单
<form>
id:<input type="text" class="check" name="id"><img src=""><br>
name:<input type="text" class="check" name="name"><img src=""><br>
age:<input type="text" class="check" name="age"><img src=""><br>
sex:<input type="text" class="check" name="sex"><img src=""><br>
sex:<input type="radio" class="check" name="xxx"><img src=""><br>
<input type="submit" value="sumbit" onclick="return onSubmitCheck()">
</form>
二、Js代码
<script type="text/javascript">
function onSubmitCheck()
{
var list = $('.check');
for(i=0;i<list.length;i++)
{
var node = list[i];
var spanNode = node.nextSibling;
alert(node.value);
if(node.value == "")
{
//alert("empty");
node.focus();
spanNode.src = "cancel.png";
//return false;
}
else
{
spanNode.src = "accept.png";
}
//alert(node.value);
}
}

</script>
三、