jquery ajax复选框状态

if ($("#yourCheckboxID").is(":checked")) {  
    // checkbox is checked 
} else {
    // checkbox is not checked 
}

<script type="text/javascript">
    $(document).ready(function(){
        $("input:checkbox").change(function() { 
            if($(this).is(":checked")) { 
                $.ajax({
                    url: 'on_off.aspx',
                    type: 'POST',
                    data: { strID:$(this).attr("id"), strState:"1" }
                });
            } else {
                $.ajax({
                    url: 'on_off.aspx',
                    type: 'POST',
                    data: { strID:$(this).attr("id"), strState:"0" }
                });
            }
        }); 
    });
</script>

<script type="text/javascript">
  $(document).ready(function(){
    var isChecked = $("input:checkbox").is(":checked") ? 1:0; 
    $.ajax({
            url: 'on_off.aspx',
            type: 'POST',
            data: { strID:$("input:checkbox").attr("id"), strState:isChecked }
    });        
  });
</script>

Adding back in the change event to the merged solution. Want this to fire every time checkbox is changed.

<script type="text/javascript">
    $(document).ready(function(){
        $("input:checkbox").change(function() { 
            var isChecked = $("input:checkbox").is(":checked") ? 1:0; 
            $.ajax({
                url: 'on_off.aspx',
                type: 'POST',
                data: { strID:$("input:checkbox").attr("id"), strState:isChecked }
            });        
        });        
    });
</script>

$(':checkbox').whatever()

Well if you've got a convention to work with (perhaps always sending "true" when checked and "false" when not checked), the next thing you have to decide is how to get them to your server. You can use the jQuery param

var params = $.param($(':checkbox').map(function() {
   return { name: this.id, value: !!this.checked };
}));

$.ajax