如何在 HTML 文件中重复使用 base64 图像

Question

我有一个 HTML 文件，可以移植分发给客户。它有一个文档索引。我想要每个文档的 PDF 或 Word 图标，但如果可以避免，我不想重复 base64 字符串 30 次。我应该怎么做？ Javascript 没问题，但我的目标是简单性和可移植性。

Answer 1

创建脚本以将其插入到图像中。我故意将脚本代码内联，因为您发送的是单个 HTML 文件：

<img alt="pdf"/>
<img alt="pdf"/>
<img alt="pdf"/>
<img alt="pdf"/>
<img alt="pdf"/>
<img alt="pdf"/>
<script>
  var images = document.getElementsByTagName('img');
for (var i = 0; i < images.length; i++){
  images[i].src = "data:image/png;base64,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";
}
</script>

Answer 2

尝试使用 CSS class

img.word-icon {
  content: url(data:image/gif;base64,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);
  width: 32px;  
  height: 32px;
}

<html>
  <body>  
    <img class="word-icon">foo
    <img class="word-icon">bar
    <img class="word-icon">
  </body>
</html>

Answer 3

使用 CSS 的另一个答案给出了正确的想法，但它并不与所有浏览器兼容。 CSS的content属性只允许出现在伪元素::before和::after中。带有内容属性的 class 的 img 标签是空的。浏览器没有义务显示它。 Chrome 尽管如此（错误地）显示它。

要使其适用于所有浏览器，请在空跨度上使用例如 ::before：

span.word-icon::before {
  content: url(data:image/gif;base64,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);
}

<html>
  <body>  
    <p><span class="word-icon"></span>Paragraph with icon.</p>
  </body>
</html>

您也可以直接将其附加到 p::before。

Answer 4

您可以使用 CSS 变量。

在页面的 <head> 部分，命名并定义变量和 class 以使用它：

:root {
    --img-123: url(data:null;base64,iVBORw………); /* your image data here */
}

.img-123 {
    background-blend-mode: normal;
    background-clip: content-box;
    background-position: 50% 50%;
    background-color: rgba(0,0,0,0);
    background-image:var(--img-123);
    background-size: 100% 100%;
    background-origin: content-box;
    background-repeat: no-repeat;
}

在页面的 <body> 部分，通过元素样式部分或 CSS classes 重复使用图像。 SVG 数据创建透明图像，通过它可以看到内容。

<img 
  class="img-123" 
  src="data:image/svg+xml,&lt;svg xmlns=&quot;http://www.w3.org/2000/svg&quot; width=&quot;16&quot; height=&quot;16&quot;&gt;&lt;rect fill-opacity=&quot;0&quot;/&gt;&lt;/svg&gt;"
>

我在开源 Firefox / Chrome 扩展程序 SingleFile 的输出中观察到了这种技术。可能有一些方法可以简化 CSS 并避免使用 SVG。

如何在 HTML 文件中重复使用 base64 图像

How to reuse base64 image repeatedly in HTML file

html

javascript

base64

static