clearInterval为什么无效？

Question

play(state,event){   const playerBar=document.getElementById("playerBar");   const eve=event.target;   let duraTime=playerBar.duration;   let duraMinute=Math.floor(duraTime/60)+":"+(duraTime%60/100).toFixed(2).slice(-2);   let currentTime=playerBar.currentTime;   let currentMinute=Math.floor(currentTime/60)+":"+(currentTime%60/100).toFixed(2).slice(-2);   let ctime;   if(playerBar.paused){     playerBar.play();     eve.innerHTML="pause";     state.audio.duration=duraMinute;     state.audio.currentTime=currentMinute;     ctime=setInterval(       function(){         duraTime--;         currentTime++;         duraMinute=Math.floor(duraTime/60)+":"+(duraTime%60/100).toFixed(2).slice(-2);         currentMinute=Math.floor(currentTime/60)+":"+(currentTime%60/100).toFixed(2).slice(-2);         state.audio.duration=duraMinute;         state.audio.currentTime=currentMinute;      },1000     )   }else{     playerBar.pause();     eve.innerHTML="play_arrow";     clearInterval(ctime);   } }play()绑定的是一个播放器的开关，，点击一次时间会动，用的是定时器setInterval，再次点击清除计时器，时间暂停，用了clearInterval，但是目前clearInterval失效，不知道什么原因，拜托大神帮看看！！

Answer 1

你每次执行函数就把ctime初始化了，你应该定义在外层