我一直使用它，效果完美。
$(document).ready(function(){
$(function(){
$('#ideal_form').submit(function(e){
e.preventDefault();
var form = $(this);
var post_url = form.attr('action');
var post_data = form.serialize();
$('#loader3', form).html('<img src="../../images/ajax-loader.gif" /> Please wait...');
$.ajax({
type: 'POST',
url: post_url,
data: post_data,
success: function(msg) {
$(form).fadeOut(800, function(){
form.html(msg).fadeIn().delay(2000);
});
}
});
});
});
});
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