Jsonp_javascript simulation in JavaScript

This article describes how to simulate jsonp in JavaScript. This article provides the implementation code directly. the code contains detailed comments. For more information, see

Function prescript (s) {if (s. cache === undefined) {s. cache = false;} if (s. crossDomain) {s. type = "GET" ;}} function prejsonp (s, originalSettings, jqXHR) {// name var callbackName = s for the callback function. jsonpCallback s. url + = (/(? :)/. Test (s. url )? "&":"? ") + S. jsonp + "=" + callbackName; // after the script is executed, use a data converter to retrieve json. // The data that is provided to the code to obtain the server is s. getData = function () {if (! ResponseContainer) {jQuery. error (callbackName + "was not called");} return responseContainer [0];}; // modify the processing mechanism s. dataTypes [0] = "json"; // create a global function overwritten = window [callbackName]; // used to collect data from the server window [callbackName] = function () {responseContainer = arguments;}; return "script";}/*** jsonp pre-processing */function inspectPrefiltersOrTransportsA (options, originalOptions, jqXHR) {// pre-process jsonp var dataTypeOrTransport = prejsonp (options, originalOptions, jqXHR) // expand dataTypes options. dataTypes. unshift (dataTypeOrTransport); // pre-processing script type prescript (options)}/*** distributor * @ return {[type]} [description] */function inspectPrefiltersOrTransportsB (s, originalOptions, jqXHR) {return {send: function (_, complete) {var script = jQuery ("script"). prop ({async: true, charset: s. scriptCharset, src: s. url }). on ("load error", callback = function (evt) {script. remove (); callback = null; if (evt) {complete ()}});//