Scene
If there are two servers with different domain names, a.com and b.com, you can get some data in the interface b.com/b_return_js.php. Of course, if it is on the page of b.com, you can use ajax to directly request this interface, but what if it is requested on the page of a.com.
Interface code of b_return_js.php:
echo 'var userdata = '.json_encode($a).';'; //Generally, if it is an in-site request from b.com, json_encode($a) will be returned directly, but if you want to use the src attribute to achieve cross-domain , here we need to assign this value to a js variable to ensure that this data can be obtained and used in the page after the script tag is loaded.
Simple implementation
There is a simple way to go to the page under a.com directly
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
