01.
<input type=
"checkbox"
name=
"chk[]"
id=
"chk1"
value=
"a"
/>
02.
<input type=
"checkbox"
name=
"chk[]"
id=
"chk2"
value=
"b"
/>
03.
<input type=
"checkbox"
name=
"chk[]"
id=
"chk3"
value=
"c"
/>
04.
<input type=
"checkbox"
name=
"chk[]"
id=
"chk4"
value=
"d"
/>
05.
06.
<script>
07.
$(
function
(){
08.
alert($(
'[name="chk[]"]:checked'
).size());
09.
});
10.
</script>