get select multiple values jquery code example

Example 1: jquery find multiple

var tds = $(this).find('input, textarea');

Example 2: jquery select2 multiple select all

$("#checkbox").click(function(){
    if($("#checkbox").is(':checked') ){
        $("select > option").prop("selected","selected");
    }else{
        $("select > option").removeAttr("selected");
     }
});