getJSON跨域SyntaxError问题分析_php实例

javascript代码如下：

$(".check_mobile").click(function(){
var mobile = $('.mobile').val();
$.getJSON("http://www.test.com/user.php?mobile="+mobile+"&format=json&jsoncallback=?", function(data){
if (data.succ == 1) {
var html = "";
$(".r_m").append(html);
}
});
});

user.php代码如下：

<?php
if($_GET){
$mobile = $_GET['mobile'];
if ($mobile == 'XXXX') {
$user = array(
'city' =>'石家庄',
'cityid' =>'1',
'community' =>'紫晶悦城',
'communityid'=>'1'
);
$sucess = 1;
$return = array(
'succ' =>$sucess,
'data' => $user
);
}else {
$sucess = 2;
$return = array(
'succ' =>$sucess
);
}
echo json_encode($return);
}
?>

相应如下：

问题出来了：

在火狐浏览器中： SyntaxError: missing ; before statement

解决方法如下：

header("Access-Control-Allow-Origin:http:www.test.com");
$b = json_encode($return);
echo "{$_GET['jsoncallback']}({$b})";
exit;

最后完整代码：

<?php
header("Access-Control-Allow-Origin:http:www.test.com");
if($_GET){
$mobile = $_GET['mobile'];
if ($mobile == '18831167979') {
$user = array(
'city' =>'石家庄',
'cityid' =>'1',
'community' =>'紫晶悦城',
'communityid'=>'1'
);
$sucess = 1;
$return = array(
'succ' =>$sucess,
'data' => $user
);
}else {
$sucess = 2;
$return = array(
'succ' =>$sucess
);
}
$b = json_encode($return);
echo "{$_GET['jsoncallback']}({$b})";
exit;
}
?>

如果在 PHP 中少了 header("Access-Control-Allow-Origin:http:www.test.com"); 代码，则会出现

XMLHttpRequest cannot load ''. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin ' ' is therefore not allowed access.
如果少了 echo "{$_GET['jsoncallback']}({$b})"; 代码

在谷歌浏览器中：Uncaught SyntaxError: Unexpected token :
在火狐浏览器中：SyntaxError: missing ; before statement