// if anything was previously selected, cancel the selected radio $(” # tj_cat pro_category ”.) each (function () {   If ($(this). Attr (” checked ”)) {                                               $(this). Attr (” checked ”, false);                                       } }); // gets the value of the selected tag Radio :(checkbox is the same as this)   Var val = $(’ input: radio [name = “sex”] : checked ’). The val ();   // the following way can also be written / / var val = $(’ sexclass: checked ’). The val (); Select: Var sel_val = $(” select [id = ‘shuini’] option: selected ”). The val (); // the following way can also be written / / var sel_val = $(’ must_write option: selected ’). The val (); / / var sel_val = $(’ # shuini option: selected ’). The val (); / / var sel_val = $(” select [name = ‘shuini1’] option: selected ”). The val ();