var arr = $("#myform1").find("input:checkbox:checked").map(function(){
return $(this).val();
}).get();
if(arr.length > 0){
$.ajax({
url: "ajax.php",
type: "POST",
data: {"check[]":arr},
dataType:"html",
success: function(data) {
alert(data);
}
});
}else{
alert('未選取任何項目');
}
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