JQuery-Form中的AjaxForm和AjaxSubmit的区别
JQuery中的AjaxForm和AjaxSubmit使用差不多功能也差不多。很容易误解。
按照作者的解释：
AjaxForm
ajaxForm不能提交表单。在document的ready函数中，使用ajaxForm来为AJAX提交表单进行准备。提交动作必须由submit开始
ajaxSubmit
马上由AJAX来提交表单。你可以在任何情况下进行该项提交。
option的参数

var options = {    
       target:        '#output1',   // target element(s) to be updated with server response    
       beforeSubmit:  showRequest,  // pre-submit callback    
       success:       showResponse  // post-submit callback    
  
       // other available options:    
       //url:       url         // override for form's 'action' attribute    
       //type:      type        // 'get' or 'post', override for form's 'method' attribute    
       //dataType:  null        // 'xml', 'script', or 'json' (expected server response type)    
       //clearForm: true        // clear all form fields after successful submit    
       //resetForm: true        // reset the form after successful submit    
  
       // $.ajax options can be used here too, for example:    
       //timeout:   3000    
   };   

示例代码摘自：http://www.malsup.com/jquery/form/#code-samples
ajaxForm
The following code controls the HTML form beneath it. It uses ajaxForm to bind the form and demonstrates how to use pre- and post-submit callbacks

// prepare the form when the DOM is ready 
$(document).ready(function() { 
    var options = { 
        target:        '#output1',   // target element(s) to be updated with server response 
        beforeSubmit:  showRequest,  // pre-submit callback 
        success:       showResponse  // post-submit callback 
 
        // other available options: 
        //url:       url         // override for form's 'action' attribute 
        //type:      type        // 'get' or 'post', override for form's 'method' attribute 
        //dataType:  null        // 'xml', 'script', or 'json' (expected server response type) 
        //clearForm: true        // clear all form fields after successful submit 
        //resetForm: true        // reset the form after successful submit 
 
        // $.ajax options can be used here too, for example: 
        //timeout:   3000 
    }; 
 
    // bind form using 'ajaxForm' 
    $('#myForm1').ajaxForm(options); 
}); 
 
// pre-submit callback 
function showRequest(formData, jqForm, options) { 
    // 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)  { 
    // 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.'); 
} 

ajaxSubmit

The following code controls the HTML form beneath it. It uses ajaxSubmit to submit the form.