拖动滑块实时调节背景模糊效果 | WebCat - 常规

<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8" name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no">
    <title>WebCat</title>
    <style>
      body {
        background-image: url('https://jsmov2.a.yximgs.com/ufile/atlas/NTI0NjY5MzY3NTEzNTQ2NjMwOV8xNjkxMDYzMTUxNTkz_11.jpg');
        background-size: cover;
        background-repeat: no-repeat;
        background-attachment: fixed;
      }
<pre><code>  #ouy {
    content: &quot;&quot;;
    width: 100%;
    height: 100%;
    position: absolute;
    left: 0;
    top: 0;
    /* 从父元素继承 background 属性的设置 */
    background: inherit;
    /*背景模糊*/
    filter: blur(1px);
    z-index: -1;
  }

  #preview {
    max-width: 80%;
  }
&lt;/style&gt;
</code></pre>
  </head>
  <body id="body">
    <div id="ouy"></div>
    <input type="file" />
    <input id="range" type="range" value="50">
    <img src="" id="preview" alt="" />
    <script>
      var inp = document.querySelector("input");
      var range = document.getElementById("range");
      var ouy = document.getElementById("ouy");
<pre><code>  range.oninput = function () {
    ouy.style.filter = `blur(${range.value / 10}px)`;
  };

  inp.onchange = function () {
    var file = inp.files[0];
    var reader = new FileReader();
    reader.onload = (e) =&gt; {
      body.style.backgroundImage = `url(${e.target.result})`;
    };
    reader.readAsDataURL(file);
  };
&lt;/script&gt;
</code></pre>
  </body>
</html>