Edit in JSFiddle

$("#res").on("click", function() {
	var chk = $("input[name='chk[]']:checked").map(function() {
		return $(this).val();
	}).get().join(" | ");
	$("#result").text(chk);
});

<input type="checkbox" name="chk[]" value="aaa">aaa
<input type="checkbox" name="chk[]" value="bbb">bbb
<input type="checkbox" name="chk[]" value="ccc">ccc
<input type="button" value="submit" id="res">
<span id="result"></span>