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I thought in the local test will not cross, the results check down is a cross-domain problem!!!!

Source: https://www.cnblogs.com/xiezn/p/5651093.html

This article implements cross-domain by setting up Access-control-allow-origin .

For example: The domain name of the client is client.runoob.com, and the requested domain name is server.runoob.com.

If you use AJAX access directly, you will get the following error:

XMLHttpRequest cannot load http://server.runoob.com/server.php. No ' Access-control-allow-origin ' header is present on the requested resource. Origin ' http://client.runoob.com ' is therefore not allowed access.

1. Allow single domain access

To specify a domain name (http://client.runoob.com) for cross-domain access, simply add the following code to the http://server.runoob.com/server.php file header:

Header(' access-control-allow-origin:http://client.runoob.com ');

2. Allow multiple domain names to be accessed

To specify multiple domain names (http://client1.runoob.com, http://client2.runoob.com, and so on) for cross-domain access, simply add the following code to the http://server.runoob.com/server.php file header:

$origin=Isset($_server[' Http_origin '])?$_server[' Http_origin '] : ; $allow _origin Span class= "pun" >= Array ( ,  ' http://client2.runoob.com '  );  if (in_array (  $origin , $allow _origin Header ( ' access-control-allow-origin: '  $origin );  } 
            /span>                

3. Allow all domain names to access

To allow all domain access, simply add the following code to the http://server.runoob.com/server.php file header:

Header(' access-control-allow-origin:* ');  

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