问题是初始选择器不能捕获后来添加的新元素。要解决这个问题，请使用.on()方法检测新插入的调用记录元素并将其添加到currentRecords。这是修改后的js。

(function worker() {
    
    //Get current records
    var currentRecords = [];
    $('.call-record').each(function () {
        currentRecords.push($(this).prop('id'));
    });

    $.ajax({
        url: '#',
        dataType: "json",
        type: "POST",
        success: function (data) {              
            //Save records to an array and find the new record. If you find a new one, prepend it 'newRow' to the page.
            $('.pending-calls').prepend(newRow);
            //e.g <div class="call-record" id="id4">Record 4</div>
        },
        complete: function () {             
            setTimeout(worker, 5000);
        }
    });

    //Bind a function to the `.pending-calls` element that will execute whenever a new `.call-record` element is added to the page.
    $('.pending-calls').on('DOMNodeInserted', '.call-record', function () {
        //Add the new element to the `currentRecords` array.
        currentRecords.push($(this).prop('id'));
    });
})();

希望这对你有用。

**PS：**请注意，当DOM频繁添加大量元素时，使用DOMNodeInserted可能会导致性能问题。如果不需要对DOM更改进行实时响应，则事件处理可能过多

我找到了解决问题的方法。我把数组currentRecords放在函数的外部，所以当页面加载时，它会用当前记录填充一次。在ajax调用之后，如果我发现了一条新记录，我就添加到列表中。

//Get current records
var currentRecords = [];
$('.call-record').each(function () {
    currentRecords.push($(this).prop('id'););
});

(function worker() {
    $.ajax({
        url: '#',
        dataType: "json",
        type: "POST",
        success: function (data) {              
            //Save records to an array and find the new record. If you find a new one, prepend 'newRow' to the page.
            if(newRowIsFound){
                //add the id in the array
                currentRecords.push(newRow.id);
           
                //Add it to the page e.g <div class="call-record" id="id4">Record 4</div>
                $('.pending-calls').prepend(newRow);
            }
        },
        complete: function () {             
            setTimeout(worker, 5000);
        }
    });
})();