js 获取 checkbox[] 值

 $("#btnAdd1").click(function () {
            console.log($("form").serialize()); 

            var checkboxs = document.getElementsByName("checkbox[]");
          var check_val = [];
            for (var i = ; i < checkboxs.length; i++) {
                if (checkboxs[i].value == "") {
                    continue;
                }
                check_val.push(checkboxs[i].value);
            }
            if (check_val.length<) {
                layer.msg("请选择数据!");
            }
        });

 var data2 =  getcheckbox("check2");
        if (data2.length < 1) {
            // alert("请选择数据!");
            layer.msg("请选择数据!");
            return;
        }
        var result1 = data1 + "";    结果 是以逗号分开的字符串