function save(){
$("#formId").ajaxSubmit({
url:"表单提交的url",beforeSubmit:function(){},//回调
type:"post",//提交类型 post  get
dataType:"json",//服务器响应的类型 xml  script  json
success:function(){},error:function(){}
});
}

<from id="formId" method="post" enctype="multipart/form-data">

<a href="javascrpit:void(0)" onclick="javascript:save();return false;">保存</a>

</from>