Summarize the explanations of the meanings of each parameter in Ajax

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1.url:
Requires that the requested address be sent as a parameter of type String (the current page address is assumed to be the default).

2.type:
A parameter of type String is required, and the request method (post or get) defaults to get. Note Other HTTP request methods, such as put and delete, can also be used, but only some browsers support it.

3.timeout:
Requires a parameter of type number to set the request time-out (in milliseconds ). This setting overrides the global setting of the $.ajaxsetup () method.

4.async:
Requires a parameter of type Boolean , which is set to trueby default and all requests are asynchronous requests. If you need to send a synchronization request, set this option to false. Note that the synchronization request locks the browser , and the user's other actions must wait for the request to complete before it can be executed.

5.cache:
A parameter that is required to be of type Boolean , which defaults to True (False when datatype is a script), and set to false will not load the request information from the browser cache .

6.data:
Requires data to be sent to the server as an Object or a String of type parameters. If it is not already a string, it is automatically converted to a string format . The GET request will be appended to the URL . To prevent this automatic conversion, you can view the processdata (prevent auto-convert) option. The object must be in key/value format, for example {foo1: "Bar1", Foo2: "Bar2"} to &foo1=bar1&foo2=bar2. In the case of arrays, jquery automatically corresponds to the same name for different values. For example {foo:["Bar1", "Bar2"]} is converted to &FOO=BAR1&FOO=BAR2.

7.dataType:
Requires a parameter of type String that expects the data type returned by the server. If not specified , jquery automatically returns Responsexml or ResponseText based on the HTTP packet mime information and is passed as a callback function parameter. The following types are available:
XML: Returns an XML document that can be processed with jquery.
HTML: Returns plain text HTML information, and the included script tag is executed when the DOM is inserted.
Script: Returns plain text JavaScript code. Results are not automatically cached. Unless the cache parameter is set. Note When you make a remote request (not under the same domain), all post requests are converted to get requests.
JSON: Returns the JSON data.
JSONP:JSONP format. When a function is called using the Sonp form, for example Myurl?callback=?,jquery will automatically replace the latter "?" is the correct function name to execute the callback function.
Text: Returns a plain text string.

8.beforeSend:
The main purpose of this parameter is to perform some operations before sending a request to the server. Parameters that require a function type can modify the functions of the XMLHttpRequest object before sending the request, such as adding a custom HTTP header. If you return False in Beforesend, you can cancel this Ajax request. The XMLHttpRequest object is the only parameter.

        function (XMLHttpRequest) {this               ;   The options parameter passed when calling this Ajax request            }

9.complete:
A parameter that is required to be a function type, called when the request is complete (invoked when the request succeeds or fails). Parameters: The XMLHttpRequest object and a string that describes the successful request type.

       function (XMLHttpRequest, textstatus) {this             ;    The options parameter passed when calling this Ajax request          }

10.success:

Requires a parameter of type Function , the callback function called after the request succeeds , there are two parameters.
(1) The data returned by the server and processed according to the datatype parameter.
(2) A string that describes the status .

         function (data, textstatus) {            //data may be xmldoc, jsonobj, HTML, text, and so on            ;  The options parameter passed when calling this Ajax request         }

11.error:
The function that is called when the request fails with a parameter that is required as a function type. The function has 3 parameters, the XMLHttpRequest object, the error message, and optionally the error object being captured. The Ajax event functions are as follows:

       function (XMLHttpRequest, textstatus, Errorthrown) {          //normally textstatus and Errorthrown only one contains information this          ;   The options parameter passed when calling this Ajax request       }

12.contentType:
A parameter of type string is required, and when the message is sent to the server, the content encoding type defaults to "application/x-www-form-urlencoded". This default value is suitable for most applications.

13.dataFilter:
A function that requires the preprocessing of the original data returned by Ajax, as a parameter of the function type. Provides data and type two parameters. Data is the original data returned by Ajax, and type is the datatype parameter that is provided when Jquery.ajax is called. The value returned by the function will be further processed by jquery.

           function (data, type) {                //returns data returned after processing                ;            }

14.dataFilter:
A function that requires the preprocessing of the original data returned by Ajax, as a parameter of the function type. Provides data and type two parameters. Data is the original data returned by Ajax, and type is the datatype parameter that is provided when Jquery.ajax is called. The value returned by the function will be further processed by jquery.

            function (data, type) {                //returns data returned after processing                ;            }

15.global:
Requires a parameter of type Boolean, which is true by default. Indicates whether global AJAX events are triggered. Setting to FALSE will not trigger global AJAX events, Ajaxstart or ajaxstop can be used to control various AJAX events.

16.ifModified:
A parameter of type Boolean is required, and the default is False. Get new data only when the server data changes. Server data changes are based on the last-modified header information. The default value is False, which ignores header information.

17.jsonp:
Requires a parameter of type string to override the name of the callback function in a JSONP request. This value is used instead of the "callback=?" The "callback" part of the URL parameter in this get or POST request, such as {jsonp: ' onjsonpload ', causes the "onjsonpload=?" passed to the server.

18.username:
A parameter of type string that is required to respond to the user name of the HTTP access authentication request.

19.password:
A parameter of type string that is required to respond to the password for HTTP access authentication request.

20.processData:
Requires a parameter of type Boolean, which is true by default. By default, the data sent is converted to an object (technically not a string) to match the default content type "application/x-www-form-urlencoded". Set to False if you want to send DOM tree information or other information that you do not want to convert.

21.scriptCharset:
A parameter of type string is required and is used to force the character set (charset) only if the request is datatype as "JSONP" or "script" and the type is get. Typically used when local and remote content encodings are different.