('videoBuffer');
    var $videoBufferDelay = document.getElementById('videoBufferDelay');
    var $replay = document.getElementById('replay');
    var $renderDom = document.getElementById('renderDom');
    var $isUseWebGPU = document.getElementById('isUseWebGPU');
    var $demuxUseWorker = document.getElementById('demuxUseWorker');
    var $recordType = document.getElementById('recordType')
    var $isFlv = document.getElementById('isFlv');


    var showOperateBtns = true; // 是否显示按钮
    var for