Perform a cross-origin ajax request test by using $. getJSON of jquery.

Jquery provides $. the getJSON method allows us to implement cross-origin ajax requests, but the content on jqueryAPI is too small. How to use $. getJSON: What kind of database should the request website return for $. after getJSON is obtained, I will use an actual example to describe it. (I am afraid that I will forget to use it later, so I don't have much explanation. If I really don't understand it, follow my code to give it a try)

I use php at the backend. One of the main functions of the following code is to provide an interface for booking and registration. The data to be imported includes the user name, contact number, and address.

......

/* Execution interface for booking registration */case "yuyue_interface": $ name = trim ($ _ GET ['name']); $ phone = trim ($ _ GET ['phone']); $ addr = trim ($ _ GET ['addr ']); $ dt = date ("Y-m-d H: I: s"); $ cb = $ _ GET ['callback']; if ($ name = "" | $ name = NULL) {echo $ cb. "({code :". json_encode (1 ). "})";} elseif ($ phone = "" | $ phone = NULL) {echo $ cb. "({code :". json_encode (2 ). "})";} elseif ($ addr = "" | $ addr = NULL) {echo $ cb. "({code :". json_encode (3 ). "})";} else {$ db-> execute ("insert into tb_yuyue (realname, telphone, danwei, dt, ischeck) values ('$ name ', '$ phone', '$ addr', '$ dt', 0) "); echo $ cb. "({code :". json_encode (0 ). "})";} exit; break;

......

Then the front-end processing is completed.

$ (Document ). ready (function () {// The following three parameters are required for booking registration var name = "name"; // varchar type, with a maximum length of 8 characters (4 Chinese characters) var phone = "phone"; // varchar type; Length: 11 bits var addr = "addr"; // varchar type; Length: 500 bits (250 Chinese characters) $. getJSON ("http: // request the website address/data. php? Ac = yuyue_interface & name = "+ name +" & phone = "+ phone +" & addr = "+ addr +" & callback =? ", Function (data) {if (data. code = 1) {// custom code alert ("name cannot be blank");} else if (data. code = 2) {// custom code alert ("the phone cannot be blank");} else if (data. code = 3) {// custom code alert ("the unit cannot be blank ");} else {// custom code alert ("Reservation successful ");}});});

Note that the "& callback =?" passed in must be included in the backend php code? "Is also output, such:

$cb = $_GET['callback'];echo $cb."({code:".json_encode(4)."})";

The above is a simple $. getJSON test. Through this test, we can learn how to use $. getJSON and How to Make an interface for cross-origin requests by others.

If you have any questions, you can raise them below. If I have made any mistake, please help me to point it out.