Ajax-запросы

    let data = new FormData();
    data.append('param1', 'value1');
    fetch('', {  
        method: 'post',  
        headers: {  
          "Content-type": "application/x-www-form-urlencoded; charset=UTF-8"  
        },  
        body: data
    }).then(function(resp) {  
        if(resp.status == 200){
            resp.text().then(function(resp){  
                console.log(resp);  
            });
        }
    });