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    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
    <script src="./utils/retry-cdn.js"></script>
    <script>
      var urlArr = [
        'https://cdnjs.cloudflare.com',
        'https://images.unsplash.com',  // img图片正确的域名
        'https://plus.unsplash.com', // 背景图正确的域名
      ]
      var retry = new RetryCDN(urlArr)
    </script>
    <link rel="styl