依次读出checkbox中的内容

var rId = [];
  var chk_value = [];

var data5="";
  var data6="";

$("input[name='checkbox']").click(function() {
   var data5 = "";
   $("#cid").val("");
   var chk_value1 = [];
   $('input[name="checkbox"]:checked').each(function() {
    chk_value1.push($(this).val());
   });
   $.each(chk_value1, function(n, value) {
    data6 = value;
    data5 = data5 + data6 + ",";
   });
   $("#cid").val(data5);
  });