渲染阻止CSS-延迟加载CSS文件

Question

我正在尝试为我的网站解决渲染过大的问题，但是它们有问题。 我用以下代码加载css文件：

<script>
  var loadDeferredStyles = function() {
    var addStylesNode = document.getElementById("deferred-styles");
    var replacement = document.createElement("div");
    replacement.innerHTML = addStylesNode.textContent;
    document.body.appendChild(replacement)
    addStylesNode.parentElement.removeChild(addStylesNode);
  };
  var raf = requestAnimationFrame || mozRequestAnimationFrame ||
      webkitRequestAnimationFrame || msRequestAnimationFrame;
  if (raf) raf(function() { window.setTimeout(loadDeferredStyles, 0); });
  else window.addEventListener('load', loadDeferredStyles);
</script>

<noscript id="deferred-styles">
  <link href="/template/styles/main.min.css" rel="stylesheet">    
  <link href="/template/styles/style.min.css" rel="stylesheet">
  <link href="/template/styles/bootstrap.min.css" rel="stylesheet">
  <link href="/template/styles/bootstrap-flipped.css" rel="stylesheet">
  <link href="/template/styles/swiper.min.css" rel="stylesheet" >
  <link href="/template/styles/fontiran.min.css" rel="stylesheet">
  <link href="/template/styles/font-awesome.min.css" rel="stylesheet">
  <link href="/template/styles/animate.min.css" rel="stylesheet">
  <link href="/template/styles/owl.carousel.css" rel="stylesheet">
  <link href="/template/styles/owl.transitions.css" rel="stylesheet">
  <link href="/template/styles/responsive.css" rel="stylesheet">
  <link href="/template/styles/theme-default.css" rel="stylesheet" type="text/css" />
</noscript>

但在“ Google页面速​​度工具>洞察”中，渲染阻止了CSS文件。 帮我解决它^ _ ^

Answer 1

您可以针对不同的媒体使用不同的样式表，

<link rel="stylesheet" media="mediatype and|not|only (media feature)" href="mystylesheet.css">
<link rel="stylesheet" media="screen and (max-height:700px)" href="style-max-700-height.css">

在媒体中，您可以编写最大宽度，最大高度，最小宽度，最小分辨率等内容，请参见https://www.w3schools.com/cssref/css3_pr_mediaquery.asp和https://www.w3schools.com /tags/att_link_media.asp

Answer 2

我认为您需要先添加CSS，然后再运行JavaScript。 您可能会在控制台上收到此代码的JavaScript错误。

<noscript id="deferred-styles">
  <link href="/template/styles/main.min.css" rel="stylesheet">    
  <link href="/template/styles/style.min.css" rel="stylesheet">
  <link href="/template/styles/bootstrap.min.css" rel="stylesheet">
  <link href="/template/styles/bootstrap-flipped.css" rel="stylesheet">
  <link href="/template/styles/swiper.min.css" rel="stylesheet" >
  <link href="/template/styles/fontiran.min.css" rel="stylesheet">
  <link href="/template/styles/font-awesome.min.css" rel="stylesheet">
  <link href="/template/styles/animate.min.css" rel="stylesheet">
  <link href="/template/styles/owl.carousel.css" rel="stylesheet">
  <link href="/template/styles/owl.transitions.css" rel="stylesheet">
  <link href="/template/styles/responsive.css" rel="stylesheet">
  <link href="/template/styles/theme-default.css" rel="stylesheet" type="text/css" />
</noscript>

<script>
  var loadDeferredStyles = function() {
    var addStylesNode = document.getElementById("deferred-styles");
    var replacement = document.createElement("div");
    replacement.innerHTML = addStylesNode.textContent;
    document.body.appendChild(replacement)
    addStylesNode.parentElement.removeChild(addStylesNode);
  };
  var raf = requestAnimationFrame || mozRequestAnimationFrame ||
      webkitRequestAnimationFrame || msRequestAnimationFrame;
  if (raf) raf(function() { window.setTimeout(loadDeferredStyles, 0); });
  else window.addEventListener('load', loadDeferredStyles);
</script>