(function(){
    
    function d(){
        let dom=document.getElementsByTagName("video")[0],
            gbc=(dom)=>{return document.getElementsByClassName(dom);};
        
        if(!dom||!dom.duration)return;

        if(dom.duration>dom.currentTime){
            if(dom.paused)dom.play();
            if(gbc("wrap_popboxes  wrap_popchapter")[0]&&gbc("wrap_popboxes  wrap_popchapter")[0].style.display!="none"){
                
                setTimeout(function(){
                    var iframe = document.getElementById('tmDialog_iframe');
                    var innerDoc = iframe.contentDocument || iframe.contentWindow.document;

                    var mun=0;
                    while(1){
                        let domm=innerDoc.getElementsByClassName("answerOption")[mun];
                        if(!domm)break;
                        if(domm.children[0].children[0].getAttribute("_correctanswer")!="0")domm.children[0].children[0].click();
                        mun++;
                    }
                    gbc("popbtn_cancel")[0].click();
                },1000);
            }
            return;
        }

        if(!gbc("next_lesson_bg tm_next_lesson")[0].children[0])return;
        console.log('下一个视频');
        gbc("next_lesson_bg tm_next_lesson")[0].children[0].click();
        setTimeout(function(){
            if(gbc("speedTab15")[0])gbc("speedTab15")[0].click();
        },2000);
        setTimeout(function(){
            if(gbc("line1bq")[0])gbc("line1bq")[0].click();
        },2000);
    }
    setInterval(d,3000);
})();