How to set up cross domain in php

Let’s first write an example without cross-domain:

$(document).ready(function(){
   $.ajax({
       type : "POST",
       url : "http://localhost/test8.php",
   });
});

Successfully responded to the message.

We write a special cross-domain example and change the domain name to 127.0.0.1:

$(document).ready(function(){
   $.ajax({
       type : "POST",
       url : "http://127.0.0.1/test8.php",
   });
});

Discover Cross-domain.

//允许所有地址跨域请求
header("Access-Control-Allow-Origin: *");

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