var options = {
    data: { key1: ‘value1‘, key2: ‘value2‘ }, //连同表单一起提交的额外数据
    target:        ‘#output1‘,   // 把服务器返回的内容放入id为output的元素中
    beforeSerialize: function($form, options) {
       // return false to cancel submit                
    },
    beforeSubmit:  showRequest,  // pre-submit callback
    success:       showResponse,  // post-submit callback
    error: function(){},//在错误中调用的回调函数。
 
    //other available options:
    url:       url        //默认是form的action，如果申明，则会覆盖
    type:      type        // 默认值是form的method("GET" or "POST")，如果声明，则会覆盖
    dataType:  null       // null（默认）、xml、script、json接受服务器端返回的类型
    clearForm: true        // 成功提交后，清除所有表单元素的值
    resetForm: true        // 成功提交后，重置所有表单元素的值
 
    //超时时间
    timeout:   3000
};

// pre-submit callback
function showRequest(formData, jqForm, options) {
    // The array of form data takes the following form:
    // [ { name: ‘username‘, value: ‘jresig‘ }, { name: ‘password‘, value: ‘secret‘ } ]
    // formData is an array; here we use $.param to convert it to a string to display it
    // but the form plugin does this for you automatically when it submits the data
    var queryString = $.param(formData);
 
    // jqForm is a jQuery object encapsulating the form element.  To access the
    // DOM element for the form do this:
    // var formElement = jqForm[0];
 
    alert(‘About to submit: \n\n‘ + queryString);
 
    // here we could return false to prevent the form from being submitted;
    // returning anything other than false will allow the form submit to continue
    return true;
}
 
// post-submit callback
function showResponse(responseText, statusText, xhr, $form)  {
    // for normal html responses, the first argument to the success callback
    // is the XMLHttpRequest object‘s responseText property
 
    // if the ajaxForm method was passed an Options Object with the dataType
    // property set to ‘xml‘ then the first argument to the success callback
    // is the XMLHttpRequest object‘s responseXML property
 
    // if the ajaxForm method was passed an Options Object with the dataType
    // property set to ‘json‘ then the first argument to the success callback
    // is the json data object returned by the server
 
    alert(‘status: ‘ + statusText + ‘\n\nresponseText: \n‘ + responseText +
        ‘\n\nThe output div should have already been updated with the responseText.‘);
}