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Google AMP amp-font用法及代码示例


amp-font用于检查字体是否已在AMP HTML页面中加载。

所需脚本：将amp-font导入标头。

HTML

<script async custom-element="amp-font"
    src="https://cdn.ampproject.org/v0/amp-font-0.1.js"> 
</script>

如果字体不可用，我们使用以下样式将字体显示为红色。



HTML

<style amp-custom> 
    :root { 
        --color-error:#B00020; 
        --color-primary:#005AF0; 
    } 
  
    @font-face { 
        font-family:'UnavailableFont'; 
        font-style:normal; 
        font-weight:400; 
        src:url(fonts/UnavailableFont.ttf) format('truetype'); 
    } 
  
    @font-face { 
        font-family:'Comic AMP'; 
        font-style:normal; 
        font-weight:400; 
        src:local('Comic AMP'), 
            url(/static/samples/fonts/ComicAMP.ttf)  
            format('truetype'); 
    } 
  
    @font-face { 
        font-family:'Comic AMP 2'; 
        font-style:normal; 
        font-weight:400; 
        src:local('Comic AMP'),  
            url(/static/samples/fonts/ComicAMP2.ttf)  
            format('truetype'); 
    } 
  
    .unavailable-font-loaded .unavailable-font { 
        font-family:'UnavailableFont'; 
    } 
  
    .comicamp-loaded .comicamp { 
        font-family:'Comic AMP'; 
    } 
  
    .comicamp2-loaded .comicamp2 { 
        font-family:'Comic AMP 2'; 
    } 
  
    .comicamp-loading .comicamp, 
    .comicamp2-loading .comicamp2, 
    .unavailable-font-loading .unavailable-font { 
        color:var(--color-primary); 
    } 
  
    .comicamp-missing .comicamp, 
    .comicamp2-missing .comicamp2, 
    .unavailable-font-missing .unavailable-font { 
        color:var(--color-error); 
    } 
</style>

属性：

  1. font-family：指定家族示例的字体：futura，georgia等。
  2. layout:定义此属性必须设置为nodisplay的特定布局。

例：在这里，第二个字体系列被设置为abc，因为没有名称为abc的系列，它以红色显示。

HTML

<!doctype html> 
<html amp> 
  
<head> 
    <meta charset="utf-8"> 
    <title>Google AMP amp-font</title> 
  
    <script async src= 
        "https://cdn.ampproject.org/v0.js"> 
    </script> 
      
    <script async custom-element="amp-font" 
src="https://cdn.ampproject.org/v0/amp-font-0.1.js"> 
    </script> 
      
    <link rel="canonical" href= 
"https://amp.dev/documentation/examples/components/amp-font/index.html"> 
      
    <meta name="viewport" content= 
"width=device-width,minimum-scale=1,initial-scale=1"> 
      
    <style amp-boilerplate> 
        body { 
            -webkit-animation:-amp-start 8s  
                steps(1, end) 0s 1 normal both; 
  
            -moz-animation:-amp-start 8s  
                steps(1, end) 0s 1 normal both; 
  
            -ms-animation:-amp-start 8s  
                steps(1, end) 0s 1 normal both; 
  
            animation:-amp-start 8s  
                steps(1, end) 0s 1 normal both; 
        } 
  
        @-webkit-keyframes -amp-start { 
            from { 
                visibility:hidden 
            } 
  
            to { 
                visibility:visible 
            } 
        } 
  
        @-moz-keyframes -amp-start { 
            from { 
                visibility:hidden 
            } 
  
            to { 
                visibility:visible 
            } 
        } 
  
        @-ms-keyframes -amp-start { 
            from { 
                visibility:hidden 
            } 
  
            to { 
                visibility:visible 
            } 
        } 
  
        @-o-keyframes -amp-start { 
            from { 
                visibility:hidden 
            } 
  
            to { 
                visibility:visible 
            } 
        } 
  
        @keyframes -amp-start { 
            from { 
                visibility:hidden 
            } 
  
            to { 
                visibility:visible 
            } 
        } 
    </style> 
  
    <noscript> 
        <style amp-boilerplate> 
            body { 
                -webkit-animation:none; 
                -moz-animation:none; 
                -ms-animation:none; 
                animation:none 
            } 
        </style> 
    </noscript> 
      
    <style amp-custom> 
        :root { 
            --color-error:#B00020; 
            --color-primary:#005AF0; 
        } 
  
        @font-face { 
            font-family:'UnavailableFont'; 
            font-style:normal; 
            font-weight:400; 
            src:url(fonts/UnavailableFont.ttf)  
                    format('truetype'); 
        } 
  
        @font-face { 
            font-family:'Comic AMP'; 
            font-style:normal; 
            font-weight:400; 
            src:local('Comic AMP'),  
                url(/static/samples/fonts/ComicAMP.ttf)  
                format('truetype'); 
        } 
  
        @font-face { 
            font-family:'Comic AMP 2'; 
            font-style:normal; 
            font-weight:400; 
            src:local('Comic AMP'),  
                url(/static/samples/fonts/ComicAMP2.ttf) 
                format('truetype'); 
        } 
  
        .unavailable-font-loaded .unavailable-font { 
            font-family:'UnavailableFont'; 
        } 
  
        .comicamp-loaded .comicamp { 
            font-family:'Comic AMP'; 
        } 
  
        .comicamp2-loaded .comicamp2 { 
            font-family:'Comic AMP 2'; 
        } 
  
        .comicamp-loading .comicamp, 
        .comicamp2-loading .comicamp2, 
        .unavailable-font-loading .unavailable-font { 
            color:var(--color-primary); 
        } 
  
        .comicamp-missing .comicamp, 
        .comicamp2-missing .comicamp2, 
        .unavailable-font-missing .unavailable-font { 
            color:var(--color-error); 
        } 
    </style> 
</head> 
  
<body> 
    <!-- ## Existing font -->
  
    <div> 
        <amp-font layout="nodisplay" 
            font-family="georgia" timeout="2000" 
            on-error-remove-class="comicamp-loading"
            on-error-add-class="comicamp-missing" 
            on-load-remove-class="comicamp-loading"
            on-load-add-class="comicamp-loaded"> 
        </amp-font> 
  
        <p class="comicamp"> 
            geeks for geeks 
        </p> 
  
    </div> 
  
    <!-- ## Unavailable font  -->
    <div> 
        <amp-font layout="nodisplay" font-family="abc" 
            timeout="2000" on-error-remove-class= 
            "unavailable-font-loading"
            on-error-add-class="unavailable-font-missing" 
            on-load-remove-class="unavailable-font-loading"
            on-load-add-class="unavailable-font-loaded"> 
        </amp-font> 
          
        <p class="unavailable-font"> 
            geeks for geeks 
        </p> 
  
    </div> 
</body> 
  
</html>

输出：




相关用法


注：本文由纯净天空筛选整理自somsagar2019大神的英文原创作品 Google AMP amp-font。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。