Ajax--getscript ()/getjson () method in jquery source code

One, $.getscript () method

• Sometimes it is completely unnecessary to get all the JavaScript files you need when the page is first loaded, and can be taken as needed.
• This function is used to dynamically load the JS file and execute the JS code in the file at the global scope.
• This function can load a cross-domain JS file. Note that the function is loading data asynchronously .
• The function belongs to the global jQuery object.

Grammar:

$ (function() {        $ ("send"). On ("click",function() {            $.getscript (" Script.js ",function() {                //// callback               //data: returned data  ///Textstatus: A string describing the status             }             );});　　　　　

Source code for the $.getscript () method:

function (URL, callback) {        return jquery.get (url, undefined, callback, "script" );    }

In this method, the $.get () method is called, and the parameters of the response are passed in.

The syntax structure of the $.get () method is as follows:

Jquery.get (URL [, data] [, success] [, type])

The $.get () method is equivalent to:

"GET""script"});

Second, $.getjson () method

• This method is used to load the JSON file
• If the URL of the request includes "callback=?" And so on, jquery automatically sees it as a JSONP and executes the corresponding callback function to get the JSON data.
• The function is to load the data asynchronously .
• The function belongs to the global jQuery object.

Grammar:

$ (function() {        $ ("send"). On ("click",function() {            $.getjson (" Test.json ",function(data) {                /// callback function
Data: Returned
Textstatus: A string describing the status of             }         );});

Source code for the $.getjson () method:

function (URL, data, callback) {        return jquery.get (URL, data, callback, "JSON" );    }

In this method, the $.get () method is also called, and the corresponding parameters are passed in.

$.getjson () is equivalent to:

"GET""JSON"});

Both the *$.getscript () and $.getjson () methods are implemented through the encapsulation of the $.get () method. Belongs to the third tier method.

In short

Third floor	$.getjson (), $.getscript ()
Second floor	$.get (), $.post ()
First floor	$.ajax ()

Ajax--getscript ()/getjson () method in jquery source code