Ajax cross-domain request cannot carry cookie problem

Client Settings 1. Native JS setting mode:

true; '

2.jQuery or Zepto setting mode:

$.ajax ({  ...  Xhrfields: {     true  },  ...})

By default, cross-origin requests do not provide credentials (cookies, HTTP authentication, and client SSL certificates, etc.). By setting the Withcredentials property to True, you can specify that a request should send credentials. This allows the cross-domain cookie to be shared, such as your two-level domain to get a cookie for your first-level domain name or vice versa. Service-Side settings The following is the settings for the PHP version:

Header ("Access-control-allow-credentials:true");

If a request with a credential is sent, but the server does not contain the header, the browser does not give the corresponding data to JavaScript. As a result, the responsetext will be an empty string, the status value is 0, and the OnError () event handler will be called.

Ajax cross-domain request cannot carry cookie problem