Jquery changes the selected status of radio/checkbox and gets the selected value (sample code)_jquery

//If it has been selected before, cancel the selected radio
$("#tj_cat .pro_category").each(function()
{
if ($(this).attr('checked ')){
                                                                                                                                                                            $(this). Same as this)
var val=$('input:radio[name="sex"]:checked').val();
//The following writing method can also be used
//var val= $('.sexclass:checked').val();
select:
var sel_val=$("select[id='shuini'] option:selected").val();
/ /The following writing method can also be used
//var sel_val=$('.must_write option:selected').val();
//var sel_val=$('#shuini option:selected').val( );
//var sel_val=$("select[name='shuini1'] option:selected").val();