Make a cross-domain Ajax request test through the $.getjson of jquery _jquery

(mainly to leave a spare, afraid of later to use their own but forget, so there is not much explanation, really do not understand the words, according to my code, you also try a bar)
My back end is in PHP, the following code is mainly implemented a function is to provide an appointment registration interface, need to pass the data are: User name, contact telephone number and address
* * Booking Registration Implementation Interface * *

Copy Code code as follows:

* * Booking Registration Implementation Interface * *
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

And then the front end is handled.

Copy Code code as follows:

$ (document). Ready (function () {
The following 3 parameters required for an appointment registration
var name = "Name"; varchar type with a maximum length of 8 digits (4 characters)
var phone = "Phone"; varchar type, 11-bit length
var addr = "Addr"; varchar type with a maximum length of 500 digits (250 characters)
$.getjson ("http://request Web 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 ("Mobile phone cannot be empty");
}else if (data.code==3) {
Custom code
Alert ("The unit cannot be empty");
}else{
Custom code
Alert ("Successful appointment");
}
});
});

It's important to note that in the back-end PHP code, the "&callback=" must be passed in. "Also lose out, such as:

Copy Code code as follows:

$CB = $_get[' callback '];
echo $CB. " ({code: ". Json_encode (4)."});

The above is a simple $.getjson experiment, through this experiment, we can learn how to use $.getjson, also can learn how to do an interface to let others cross domain request.
If you have any questions, you can put them down below and if I'm wrong, please point them out for me.