在window.RemoveEventListener上是否混淆，如果它将删除一个Function

Question

我是使用Jquery窗口的新手，我只是想问一下，因为我很困惑我是否正确使用了addEventListener和removeEventListener？

当我选择不是第3个标签的标签时，我只想删除DOMContentLoaded。如何检查eventListener是否已删除？谢谢enter code here

var currentTabIndex =  $("#example-tabs").steps("getCurrentIndex").val();

if(currentTabIndex == 2){
                AddDomContentLoaded();
                }
                else{
                RemoveDomContentLoaded();
                }

function AddDomContentLoaded() {
            window.addEventListener("DOMContentLoaded", GetDomContentLoaded(), false);
        }

    function RemoveDomContentLoaded() {
            window.removeEventListener("DOMContentLoaded", GetDomContentLoaded());
        }

    function GetDomContentLoaded() {
                var video = document.getElementById("video");
                function successCallback(stream) {
                    // Set the source of the video element with the stream from the camera
                    if (video.mozSrcObject !== undefined) {
                        video.mozSrcObject = stream;
                    } else {
                        //video.src =  (window.URL && window.URL.createObjectURL(stream)) || stream;
                        //                var binaryData = [];
                        //                binaryData.push(data);
                        //                window.URL.createObjectURL(new Blob(binaryData, { type: "application/zip" }))
                        video.srcObject = stream;

                    }
                    video.play();
                }

                function errorCallback(error) {
                    $('[id^="capture"]').hide();
                }

                navigator.getUserMedia = navigator.getUserMedia || navigator.webkitGetUserMedia || navigator.mozGetUserMedia || navigator.msGetUserMedia;
                window.URL = window.URL || window.webkitURL || window.mozURL || window.msURL;

                // Call the getUserMedia method with our callback functions
                if (navigator.getUserMedia) {
                    navigator.getUserMedia({ video: true }, successCallback, errorCallback);
                }
            }