小白提个问 为什么播放器就是不运行

<!doctype html\>  
<html lang\="en"\>  
<head>  
 <style>  \*{  
            margin: 0;  
  padding: 0;  
  list-style: none;  
  }  
        a{  
            list-style: none;  
  text-decoration: none;  
  }  
      .box{  
          width: 800px;  
  height: 500px;  
  border: 1px red solid;  
  margin: 50px auto;  
  display: flex;  
  }  
        .main{  
            background: aquamarine;  
  flex: 5;  
  display: flex;  
  flex-direction: column;  
  
  }  
        .list{  
            background: blueviolet;  
  flex: 1;  
  }  
        .player{  
            background: antiquewhite;  
  flex: 5;  
  }  
        .controls{  
            flex: 1;  
  display: flex;  
  align-items: center;  
  text-align: center;  
  }  
        .list li{  
            width: 100px;  
  line-height: 30px;  
  text-align: center;  
  height: 30px;  
  background: darkgoldenrod;  
  margin-bottom: 5px;  
  margin-left: 10px;  
  }  
        video{  
            width:100%;  
  height: 100%;  
  }  
        .btn-play{flex: 1}  
        .progress{  
            flex: 8;  
  background: blue;  
  height: 10px;  
  overflow: hidden;  
  }  
        .in{  
            width: 10%;  
  height: 10px;  
  background: yellow;  
  }  
        .volume{  
            flex: 3;  
  }  
        .btn-full{  
            flex: 1;  
  }  
    </style>  
<!--    <script src="jQueryDownload/jquery-1.8.3.min.js"></script>-->  
  <link rel\="stylesheet" href\="css/font-awesome.css"\>  
 <meta charset\="UTF-8"\>  
 <meta name\="viewport"  
  content\="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0"\>  
 <meta http-equiv\="X-UA-Compatible" content\="ie=edge"\>  
 <title>Document</title>  
</head>  
<body>  
<div class\="box"\>  
 <div class\="main"\>  
 <div class\="player"\>  
 <video src\="video/回报母爱感念亲恩沙画艺术母亲.mp4" controls \></video>  
 </div> <div class\="controls"\>  
 <a href\="" class\="btn-play fa fa-play"\></a>  
 <div class\="progress"\>  
 <div class\="in"\></div>  
 </div> <input type\="range" class\="volume"\>  
 <a href\="" class\="btn-full fa fa-arrows-alt" \></a>  
 </div> </div> <ul class\="list"\>  
 <li>11111</li>  
 <li>22222</li>  
 <li>33333</li>  
 </ul></div>  
  
  
  
</body>  
</html>  
<script>  
  
  var playbtn\=document.querySelector(".btn-play");  
 var video\=document.querySelector("video");  
  playbtn.onclick\=function () {  
             video.play();  
  }  
</script>
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