form 表单提交 ajax

//如果提交按钮是A标签的时候，
<form id="fm" action="www.baidu.com">
<input type="text" name="aaa">
<a href="javascript:void(0)" onclick="sumbit()">
<a href="javascript:void(0)" onclick="window.location.href=www.baidu.com?aaa=$('[name=aaa]').val()">
<a href="javascript:void(0)" onclick="$.ajax({url:'www.baidu.com',data:{aaa:$('[name=aaa]').val()},success:function(){}})">
</form>




//如果提交表单后返回一个成功页面，时先把FORM提交到一个IFRAME上面
<form method="post" action="http://cmsapp.koolearn.com/formguide.php?formid=65&siteid=2" target="myform" name="myform" id="myform">
     <input type="text" name="info[username_cet]" id="username_cet"  value="请输入真实姓名"  />
     <input type="text" name="info[email_cet]" id="email_cet" value="输入邮箱地址接收预约通知"  />
     <input type="text" name="info[mobile_cet]" id="mobile_cet" value="输入手机号码接收预约通知"  />
     <input type="submit" name="dosubmit" id="dosubmit" class="layer_mask_dl_btn" value="提 交" />
    </form>

<iframe  name="myform" id="myform" style="width:0;height:0;"></iframe>





ajax:
1、
$('#dosubmit').click(function(){
        var demo1 = $('#demo1').val();
        var demo2 = $('#demo2').val();
        var demo3 = $('#demo3').val();
        var url = '';
        var param = {demo1:demo1,demo2:demo2,demo3:demo3};
        $.ajax({url:url,data:param,dataType:'json',type:'get',
            success:function(r){

            },
            error:function(){

            }
        });

    });


2、
$('#dosubmit').click(function(){
        var param = {};
        $('.AAinput_text').each(function(){
            var name = $(this).attr('name');
            var val = $(this).val();
            param[name]=val;
        });

        var url = '';
        $.ajax({url:url,data:param,dataType:'json',type:'get',
            success:function(r){

            },
            error:function(){

            }
        });

    });