What is the jqXHR object of jQuery.getJSON
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If the URL contains the string "callback=?" (or similar parameters, depending on how the server-side API is defined), the request is considered to be in JSONP form. For more details on jsonp data types, see $.ajax ().
The jqXHR Object (jqXHR object)
Note: it is estimated that the jQuery official did not update this api in time, which is different from the description of the jqXHR object in jQuery.get () api.
Starting with jQuery 1.5, all jQuery's Ajax methods return a superset of XMLHTTPRequest objects. This jQuery XHR object, or "jqXHR," returned through the $. Get () method, implements the Promise interface so that it has all the properties, methods, and behaviors of Promise (see Deferred object for more information). For ease of use in $.ajax (), the jQuery XHR object $.ajax () also provides .error () .success () and .complete () methods. These methods take a function argument that is called when the request is terminated. This function takes the same parameters as the callback function name of $.ajax ().
The Promise interface also allows jQuery's Ajax methods, including $.getJSON (), to be associated with .success (), .complete (), and .error () callbacks in a separate request, and even allows you to assign callbacks after the request has been completed. If the request has been completed, the callback function is called immediately.
/ / Assign handlers immediately after making the request
/ / and remember the jqxhr object for this request
Var jqxhr = $.getJSON ("example.json", function () {
Alert ("success")
})
.success (function () {alert ("second success");})
.error (function () {alert ("error");})
.complete (function () {alert ("complete");})
/ / perform other work here...
/ / Set another completion function for the request above
Jqxhr.complete (function () {alert ("second complete");})
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