ajax / get requests

. 1 <Script>
 2     window.addEventListener ( 'Load', function (EV) {
 . 3         var BTN = document.getElementById ( 'Send' );
 . 4         btn.addEventListener ( 'the Click', function (EV1) {
 . 5              // . 1. Create a request object 
. 6              var XHR = new new the XMLHttpRequest ();
 . 7  
. 8              // 2. ready to send 
. 9              xhr.open ( 'GET', 'HTTP: // localhost: 3000 / API / One', to true );
 10  
. 11              / / 3 transmits a request 
12 is              xhr.send ();
 13 is  
14              //4. The response server monitor 
15              xhr.addEventListener ( 'the readystatechange', function (EV2) {
 16                   // the console.log (xhr.readyState); 
. 17                   IF (xhr.readyState ===. 4 ) {
 18 is                       // means that the server in response to the end of a 
19                       @ response does not mean that the secondary weapon is necessarily correct 
20 is                       // the console.log (xhr.status); 
21 is                       IF (=== 200 is xhr.status ) {
 22 is                           the console.log (xhr.response);
 23 is                           the console.log (xhr.responseText);
 24                       }
 25                   }
 26 is             });
27        });
28    });
29 </script>