juery动态添加和删除

拼语句添加框（不能删除原有的tr）

//点击a标签
        $("#a").on("click",function(){
            var $newtr = $("<tr  id='model'>"
                        +"<td><input type='text' name='contacts.contactName' value=''></td>"
                        +"<td><input type='text' name='contacts.contactTel' value=''></td>"
                        +"<td><input type='text' name='contacts.contactFax' value=''></td>"
                        +"<td><input type='text' name='contacts.contactEmail' value=''></td>"
                        +"<td><input type='text' name='contacts.contactRole' value=''></td>"
                        +"<td ><a href='javascript:void(0);' class='del'>删除</a></td>"
                        +"</tr>");
            $newtr.find(".del").click(function(){
                $(this).parents("tr").remove();
            });
            $("#fourdiv").append($newtr);
        });

删除之前有的tr

$(".del").click(function(){
            $(this).parents("tr").remove();
        });    

效果图

aaarticlea/png;base64,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" 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