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This article mainly shows you the "jQuery $.ajax () function can be called without parameters of the example analysis", the content is easy to understand, clear, hope to help you solve doubts, the following let Xiaobian lead you to study and learn "jQuery $.ajax () function can be called without parameters of the example analysis" of this article.

All Ajax requests sent by jQuery are internally implemented by calling the $.ajax () function. There is usually no need to call this function directly, but you can use several encapsulated simple methods, such as $.get () and .load (). If you need to use options that are not common, $.ajax () is more flexible to use.

In a nutshell, the $.ajax () function can be called without arguments:

$.ajax ()

Note: all options can be set globally through the $.ajaxSetup () function.

In this example, the contents of the current page are loaded without using options, but the results are useless. To use the results, we can implement one of the callback functions.

JqXHR object

Starting with jQuery 1.5, $.ajax () returns a XMLHttpRequest (jqXHR) object, which is a superset of the browser's native XMLHttpRequest object. For example, it contains responseText and responseXML properties, as well as a getResponseHeader () method. When the transport mechanism is not XMLHttpRequest (for example, when a JSONP request script returns a script tag), the jqXHR object simulates the native XHR functionality as much as possible.

Since jQuery 1.5.1, the jqXHR object also contains the overrideMimeType method (which is valid in jQuery 1.4.x, but temporarily removed in jQuery 1.5). The .overrideMimeType () method may be used in the callback function of beforeSend (), for example, to modify the Content-Type header of the response:

$.ajax ({

Url: "https://cache.yisu.com/upload/information/20220117/488/15461.jpg",

BeforeSend: function (xhr) {

Xhr.overrideMimeType ("text/plain; charset=x-user-defined")

}

}) .done (function (data) {

If (console & & console.log) {

Console.log ("Sample of data:", data.slice (0100))

}

})

These are all the contents of the article "sample Analysis of the $.ajax () function in jQuery that can be called without arguments". Thank you for reading! I believe we all have a certain understanding, hope to share the content to help you, if you want to learn more knowledge, welcome to follow the industry information channel!

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