Global configuration of Ajax requests and global ajax requests

Global configuration of Ajax requests and global ajax requests
Abstract:

JQuery has become the most common js library in the project and is also the favorite library for front-end development. The following describes how to encapsulate jQuery Ajax in the project and share it with you.

Code:

// Ajax request parameter var ajaxSettings = function (opt) {var url = opt. url; var href = location. href; // determine whether cross-origin request var requestType = 'jsonp'; if (url. indexOf (location. host)>-1) requestType = 'json'; requestType = opt. dataType | requestType; // whether to asynchronously request var async = (opt. async === undefined? True: opt. async); return {url: url, async: async, type: opt. type | 'get', ype: requestType, cache: false, data: opt. data, success: function (data, textStatus, xhr) {/** if dataType is json, how can I determine whether the returned data is in json format, if conversion is not performed * General data Format * {* "code": 200, * "data": [], * "success ": true // success *} * returned data upon failure * {* "code": 200, * "info": 'error', * "success ": false // failed *} */if (requestType = 'json' | RequestType = "jsonp") & typeof (data) = "string") {data = JSON. parse (data);} if (data. success) {opt. success (data);} if (opt. error) {opt. error (data) ;}}, error: function (xhr, status, handler) {if (opt. error) opt. error () ;};}; function unescapeEntity (str) {var reg = /&(?: Nbsp | #160 | lt | #60 | gt | 62 | amp | #38 | quot | #34 | cent | #162 | pound | #163 | yen | #165 | euro | #8364 | sect | #167 | copy | #169 | reg | #174 | trade | #8482 | times | #215 | divide | #247 ); /g, entity = {'& nbsp;': '', '& #160;':'', '& lt;': '<', '& #60; ':' <',' & gt; ':'> ',' & 62; ':'> ',' & amp ;':'&', '& #38;': '&', '& quot;': '"', '& #34;': '"', '& cent ;': 'hangzhou', '& #162;': 'hangzhou', '& pound;': '£', '& #163;': '£', '& yen; ': '000000',' & #165; ': '000000',' & euro; ':' €', '& #8364;': '€ ', '& sect;': '§', '& #167;': '§', '& copy ;':'©',' & #169 ;':'©',' & Reg ;':'®',' & #174 ;':'®',' & Trade ;':'™',' & #8482 ;':'™',' & Times; ':' × ',' & #215; ':' × ',' & divide; ': 'region',' & #247 ;': 'condition'}; if (str = null) {return '';} str = str. toString (); return str. indexOf (';') <0? Str: str. replace (reg, function (chars) {return entity [chars] ;}) ;}// convert the html entity $. ajaxSetup ({global: true, cache: false, converters: {'text json': function (response) {return jQuery. parseJSON (unescapeEntity (response) ;}});/** Ajax request permission exception * user permission error jump to login page * 404 error jump to 404 page */$ (document ). ajaxComplete (function (evt, req, settings) {if (req & req. responseJSON) {var json = req. responseJSON; if (json. code = = 403 & json.info = 'perm error '&&! Json. success) {window. location. href = location. protocol + '//' + location. hostname; return;} if (json. code === 404 &&! Json. success) {window. location. href = location. protocol + '//' + location. hostname + '/404.html' ;}});/** Ajax request error prompt * For example: 500 Error * returned error message format * {* code: 500, * info: system exception *} */$ (document ). ajaxError (function (evt, req, settings) {if (req & (req. status = 200 | req. status = 0) {return false;} var msg = 'error: '; if (req & req. responseJSON) {var json = req. responseJSON; msg + = json. code | ''; msg + = json.info | 'System exception. Please try again ';} else {msg = 'System exception. Please try again ';} alert (msg );});

 

 

Summary:

To execute an Ajax request, you only need to call the ajaxSettings function, as shown below:

$.ajax(ajaxSettings({    url: '',    data: ''}))