jquery checkbox （选中和取消选中事件on("change")）做笔记

 $("#btn_Company").attr("disabled", "disabled");

  $("#agency").on("change", function () {
                //点击之后如果变成打钩时触发
                if ($(this).attr("checked") == "checked") {
                    $("#txt_NumCompany_").removeAttr("disabled");
  
                    $("#btn_Company").removeClass("button l-btn").addClass("button l-btn l-btn-disabled");
                }
               //点击之后变为不是打钩时触发
                else
                {
                    $("#txt_NumCompany_").attr("disabled", "disabled");
                    $("#btn_Company").removeClass("button l-btn l-btn-disabled").addClass("button l-btn");
                }
            });

 if ($("#agency").attr("checked") == "checked") {
                    return false;
                }