<form name="myform" method="post" action="order_info.php">
<input type="checkbox" name="cartid[]" checked>
<input type="checkbox" name="cartid[]">
<input type="checkbox" name="cartid[]">
<input type="checkbox" name="cartid[]">
<a class="submit" onClick="sendcart()">去结算</a>
</form>
<script type="text/javascript">
function sendcart(){
var cartid = document.getElementsByName("cartid[]");
var cart_checkbox = false ;//标记判断是否选中一个
for(var i=0;i<cartid.length;i++){
if(cartid[i].checked){
cart_checkbox = true ;
break ;
}
}
if(!cart_checkbox){
alert("未选择")
}
}
</script>
