Based on jQuery, implement the check box selection all, unselect all, and inverse selection function_jquery

         $(function(){
                  $("#checkedAll").click(function(){
                                                       $('[name=items]:checkbox').attr('checked',true);
              });
                 $("#checkedNo").click(function(){
                                                           $('[name=items]:checkbox').attr('checked',false);
              });
                $("#checkedRev").click(function(){
                        $('[name=items]:checkbox').each(function(){
//$(this).attr('checked',!$(this).attr('checked'));
This.checked = !this.checked;
                 });
              });
                 $("#send").click(function(){
Var Str = "What you choose is: n";
                      $('[name=items]:checkbox:checked').each(function(){
                       str = $(this).val() "rn";
                });
alert(str);
              });
        });

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