jQuery实现统计复选框选中数量

        function countNum(){
          //alert($('input[name=check]:checked').length);
         var arrays = new Array();
          var items = document.getElementsByName("check");
          for(var i=0;i               if(items[i].checked){
                  arrays.push(items[i].value);
              }
          }
          alert(arrays.length);
        }