jquery ajax element.children.length没有得到更新

Question

我们每隔5秒进行一次ajax调用，目的是将其内容附加到现有父元素。此父元素最多包含25个元素，因此大多数元素都可以从父元素的开头删除。一切都按预期工作，除了我们输出contentLength的console.log调用。 contentLength的大小不断增加，但它应该是25.我认为这与我们正在进行ajax调用这一事实有关，而且在ajax调用中此时DOM长度“不正确”。难道我做错了什么？我怎么能绕过这个？

    AJS.$.ajax({
        url: "ajax.action?",
        success: function (data) { 

                            //Cleanup and insert into parent div
                var divID   = "#" + insertContentIntoDiv;
                var wrapped = AJS.$("<div>" + data + "</div>");
                AJS.$(wrapped).find('title').remove().end();
                wrapped     = AJS.$(wrapped).find('meta').remove().end();
                AJS.$(divID + " dt:last-child").after(wrapped.html().trim());

                //Remove any whitespace pre-pended to parent element
                cleanWhiteSpaceFromElement(insertContentIntoDiv);

                //Remove child elements starting at beginning
                var parentElement = document.getElementById(insertContentIntoDiv);
                if(parentElement){

                    var contentLength = parentElement.childNodes.length;

                    console.log("________________cont: " + contentLength);
                    if(contentLength > 0){

                        var difference = contentLength - maxDisplayedLines;
                        console.log("___________removing: " + difference);
                        if(difference > 0){
                            AJS.$(divID + " dt:lt(" + difference + ")").remove();
                        }
                    } else {
                        console.log("ElementID " + insertContentIntoDiv + " appears to have no children. Was this expected?");
                    }
                } else {
                    console.log("ElementID " + insertContentIntoDiv + " NOT found. Log parsing will NOT be done");
                }
        },
        dataType: 'html'
    });