邮政和阿贾克斯之间的区别？

This jquery forum thread sums it up:

$.post is a shorthand way of using $.ajax for POST requests, so there isn't a great deal of difference between using the two - they are both made possible using the same underlying code. $.get works on a similar principle.

—addyosmani

In short, this:

$.post( "/ajax", {"data" : json })

Is equivalent to the following:

$.ajax({
type: "POST",
url: "/ajax",
data: {"data": json}
});

The problem here is not the fact $.ajax() is not working, it is because you did not set the type parameter in the Ajax request and it defaults to a GET request. The data is sent via the query string for get and if your backend expects them as post parameters, it will not read them.

$.post is just a call with $.ajax(), just with the type set. Read the docs and you will see that $.ajax() defaults to a GET as I mentioned above.

If you go to the jQuery.post page in the jQuery docs it shows you the $.ajax request with the type set. Again read the docs.

Are you specifying this as the data parameter. $.post is just a shorthand for $.ajax which is expecting the following.

$.ajax({
type : 'POST',
url : url,
data : data,
success : success,
dataType : dataType
});

After re-reading some online documentation, I decided to stick with $.post over $.ajax.

The $.ajax method's data param does something different than the $.post method does, not sure what exactly, but there is a difference.

The only reason I wanted to use $.ajax is because I wanted to be able to handle events and didn't realize I could do so with $.post.

Here is what I ended up with

function GetSearchItems() {
var url = '@Url.Action("GetShopSearchResults", "Shop", New With {.area = "Shop"})';
var data = $("#ShopPane").serialize();
// Clear container
$('#shopResultsContainer').html('');
// Retrieve data from action method
var jqxhr = $.post(url, data);
// Handle results
jqxhr.success(function(result) {
//alert("ajax success");
$('#shopResultsContainer').html(result.ViewMarkup);
});
jqxhr.error(function() {
//alert("ajax error");
});
jqxhr.complete(function() {
//alert("ajax complete");
});


// Show results container
$("#shopResultsContainer").slideDown('slow');
}

JQuery 3.x

The jqXHR.success(), jqXHR.error(), and jqXHR.complete() callback methods are removed as of jQuery 3.0. You can use jqXHR.done(), jqXHR.fail(), and jqXHR.always() instead.

var jqxhr = $.post(url, data);
// Handle results
jqxhr.done(function(result) {
//alert("ajax success");
});
jqxhr.fail(function() {
//alert("ajax error");
});
jqxhr.always(function() {
//alert("ajax complete");
});

https://api.jquery.com/jquery.post/

In $.ajax you are able to synchronize, but it is not possible in the $.post function. To synchronize means that you can get the returned result.

var tmp;
$.ajax({
'async': false,
'type': "POST",
'global': false,
'dataType': 'html',
'url': "Your Url",
'data': {'type': 'data'},
'success': function (data) {
tmp = data;
}
});
alert(tmp);

Just as a complementary, in the accepted answer, it is mentionned that "The $.ajax method's data param does something different than the $.post method does, not sure what exactly, but there is a difference"

please try using :

    {
...
data: JSON.stringify(yourJsonData),
...
}

Else the json object get's inserted in the payload as a url-encoded string.

Using $.ajax we can make GET or POST requests. Using $.post we can make only post request. Using $.get we can make only get request.

$.ajax()    // Performs an async AJAX request
$.get()     // Loads data from a server using an AJAX HTTP GET request
$.post()    // Loads data from a server using an AJAX HTTP POST request