ajax / post request

. 1 <Script>
 2      window.addEventListener ( 'Load', function (EV) {
 . 3          var BTN = document.getElementById ( 'Send' );
 . 4          btn.addEventListener ( 'the Click', function (EV1) {
 . 5  
. 6              // . 1 Get content input by the user 
. 7              var Account = document.getElementById ( 'Account' ) .Value;
 . 8              var pwd = document.getElementById ( 'pwd' ) .Value;
 . 9  
10              // 2. Create a network request object 
. 11              var XHR = new new the XMLHttpRequest ();
 12 is             xhr.open('post', 'http://localhost:3000/api/five', true);
13             // 设置请求头
14             xhr.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
15 
16             xhr.send('name=zs&age=19');
17             xhr.addEventListener('readystatechange', function (ev2) {
18                 if(xhr.readyState === 4 ){
19                    if(xhr.status === 200){
20                        console.log(xhr.responseText);
21                    }else {
22                        console.log ( 'Request failed!' );
 23 is                     }
 24                  }
 25              });
 26 is          });
 27      });
 28 </ Script>