<script language="javascript">
var str="1,2,,3,,,";
val = new Array();
val=str.split(',');
for(i=0;i<val.length;i++)
{
if (val[i]=="")
{window.alert('空!');
break;}}
</script>
var str="1,2,,3,,,";
val = new Array();
val=str.split(',');
for(i=0;i<val.length;i++)
{
if (val[i]=="")
{window.alert('空!');
break;}}
</script>
<form>
<input type="text" id="txt">
<input type="button" value="check" onclick="a()">
</form>
<script language="javascript">
function a(){
var obj=document.getElementById("txt");
var patrn=/,,/;
var patrn1=/,$/
if (patrn.test(obj.value)||patrn1.test(obj.value))
alert("非法格式")
}
</script>
</body>
<body>
<form>
<input type="text" id="txt">
<input type="button" value="check" onclick="a()">
</form>
<script language="javascript">
function a(){
var obj=document.getElementById("txt");
var patrn=/(,)(\1|$)/g;
if (patrn.test(obj.value)||obj.value=="")
alert("非法格式")
}
</script>
</body>