Use JSON data format in Ajax requests

 

1. Front-end page (cross-origin can be implemented using jquery's getjson function)

 

 

Note: Both HTML and PHP pages use GBK encoding.

   Function item (Num, username) {var user = encodeuri (username); // encode Chinese Characters in Ajax (JS uses utf8 format) $. getjson ("getitem. php? Callback =? ", {Num: num, // note the end comma, followed by the parameter name, followed by the parameter value User: User}, function callback (JSON) {var STR = ""; for (VAR I = 0; I <JSON. length; I ++) Alert (decodeuri (JSON [I]. name) + JSON [I]. age); // decoding is required when the Encoded chinese data is returned });}

 

 

2. backend page (implemented in PHP)

$ Callback = $ _ Get ["Callback"]; // not available <br/> $ num = $ _ Get ["num"]; <br/> $ user = iconv ("UTF-8", "GBK", urldecode ($ _ Get ["user"]); // The USER parameter passed by Ajax must be decoded first, transcode to GBK </P> <p> // assume that the $ num and $ USER Parameters are used to implement some business logic, finally, an array is generated to indicate the names and ages of some people. <br/>/* $ rs = array (<br/> array ('A' => 'zhang san ', 'B' => '21'), <br/> array ('A' => 'lily', 'B' => '22 '), <br/> array ('A' => 'wang 5', 'B' => '23') <br/> ); */</P> <p> $ arr = array (); <br/> foreach ($ RS as $ row) <br/> $ arr [] = array ('name' => urlencode (iconv ('gbk', 'utf-8', $ row ['a']), 'age' => $ row ['B']); <br/> // transcode Chinese to uft8 format before encoding, JSON cannot recognize Chinese Characters in Ajax requests <br/> $ JSON = json_encode ($ ARR); // convert the PHP array to JSON format </P> <p> echo $ callback. "(". $ JSON. ")"; // JSON data should be enclosed in parentheses (). This Code returns the information to the callback function of the front-end Js.