before I destroy the instance in demo, the instance is reinitialized, which is ok:

var handler = function () {
    alert(12111);
}
var handler1 = function () {
    alert(22222);
}
var player;
play(handler);
function play(handler) {
    videojs("example_video_1",
        {
            "techOrder": ["html5", "flash"],
            fluid: true,
            "controls": true,
            "bigPlayButton": false,
            flash: {
                swf: "js/swf/video-js.swf"
            },
            controlBar: {
                muteToggle: false,
                captionsButton: false,
                chaptersButton: false,
                playbackRateMenuButton: false,
                LiveDisplay: false,
                subtitlesButton: false,
                remainingTimeDisplay: false,
                progressControl: false,
                volumeMenuButton: {
                    inline: false,
                    vertical: true
                },//
                fullscreenToggle: false
            }
        }
        , function () {
            var id = $("-sharpexample_video_1").find("video")[0].id;
            player = this;
            player.src("http://180.97.83.70:30220/media/adinfo/2018/05/1920x1080_1.mp4");
            player.play();
            $("-sharpexample_video_1").find("button").show();
            console.log(player.duration())
            this.on("loadeddata", handler);
            this.on("ended", function () {
                this.pause();
            })
        });
}
setTimeout(function () {
    player.dispose();
    $("-sharpbt").before("<video id="example_video_1" class="video-js vjs-default-skin" controls width="640" height="264"></video>")
    play(handler1);
}, 3000);

:
//video.js video
    function playWithVideoJs(handler,url) {
        var divFirst = $("-sharpNER_EshowadvImgAdv_ad").parent().find("div")[0];
        if (notNull(divFirst) && divFirst.id == "NER_EshowadvVideoAdv_ad") {
            $("-sharpNER_EshowadvImgAdv_ad").parent().find("div")[0].remove();
            $("-sharpNER_EshowadvImgAdv_ad").after("<video id="NER_EshowadvVideoAdv_ad" controls class="video-js vjs-default-skin vjs-big-play-centered vjs-fluid"></video>");
        }
        if (notNull(myPlayer1)) {
            myPlayer1.dispose();
        }
        videojs("NER_EshowadvVideoAdv_ad", {
            "techOrder": ["html5", "flash"],
            fluid: true,
            example_option: true,
            // "controls": false,
            "bigPlayButton": false,
            flash: {
                swf: "js/swf/video-js.swf"
            },
            controlBar: {
                muteToggle: false,
                captionsButton: false,
                chaptersButton: false,
                playbackRateMenuButton: false,
                LiveDisplay: false,
                subtitlesButton: false,
                remainingTimeDisplay: false,
                progressControl: false,
                volumeMenuButton: {
                    inline: true,
                    vertical: false
                },//
                fullscreenToggle: false
            }
        }, function () {
            myPlayer1 = this;
            var videoID = $("-sharpNER_EshowadvVideoAdv_ad").find("video")[0].id;
            $("-sharp" + videoID).prop("src", url);
            // $("-sharpNER_EshowadvVideoAdv_ad").find("button").off("click").on("click", function () {
            $("-sharpNER_EshowadvVideoAdv_ad").find("video")[0].play();
            // });
            //--
            this.on("loadedmetadata", handler);
        });
    }

what kind of problem is this? For the first time, use video.js, to get down on your knees and ask for advice. Thank you.