Answers for "what is ajax in javascript"

ajax request in javascript

fetch('https://api.covid19api.com/summary')
            .then(response => response.json())
            .then(data => console.log(data))
            .catch(err => {
                console.log(err)
            });

ajax syntax in javascript

var id = empid;

$.ajax({
    type: "POST",
    url: "../Webservices/EmployeeService.asmx/GetEmployeeOrders",
    data: "{empid: " + empid + "}",
    contentType: "application/json; charset=utf-8",
    dataType: "json",
    success: function(result){
        alert(result.d);
        console.log(result);
    }
});

ajax

With Ajax, web applications can send and retrieve data from a server asynchronously without interfering with the display and behaviour of the existing page.