谁能告诉我svg中的<g>和</g>是什么？

Question

我有这个svg。谁能告诉我所有的和都是用来做什么的，可以去掉吗？

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   <?xml version="1.0" encoding="iso-8859-1"?>
    <!-- Generator: Adobe Illustrator 19.0.0, SVG Export Plug-In . SVG Version: 6.00 Build 0)  -->
    <svg version="1.1" id="Layer_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
    	 viewBox="0 0 490.034 490.034" style="enable-background:new 0 0 490.034 490.034;" xml:space="preserve">
    <g>
    	<g>
    		<path d="M435.667,54.311c-7-7.1-18.4-7-25.5,0l-64,64c-79.3-36-163.9-27.2-244.6,25.5c-60.1,39.2-96.6,88.5-98.1,90.6
    			c-4.8,6.6-4.6,15.6,0.5,22c34.2,42,70,74.7,106.6,97.5l-56.3,56.3c-7,7-7,18.4,0,25.5c3.5,3.5,8.1,5.3,12.7,5.3s9.2-1.8,12.7-5.3
    			l356-355.9C442.667,72.811,442.667,61.411,435.667,54.311z M200.467,264.011c-2.6-5.9-3.9-12.3-3.9-19c0-12.9,5-25.1,14.2-34.3
    			c14.4-14.4,35.7-17.8,53.3-10.3L200.467,264.011z M290.667,173.911c-32.7-21-76.8-17.2-105.3,11.3c-16,16-24.7,37.2-24.7,59.7
    			c0,16.4,4.7,32.1,13.4,45.6l-37.1,37.1c-32.5-18.8-64.5-46.6-95.6-82.9c13.3-15.6,41.4-45.7,79.9-70.8
    			c66.6-43.4,132.9-52.8,197.5-28.1L290.667,173.911z"/>
    	</g>
    </g>
    <g>
    	<g>
    		<path d="M486.067,233.611c-24.7-30.4-50.3-56-76.3-76.3c-7.9-6.1-19.2-4.7-25.4,3.1c-6.1,7.8-4.7,19.1,3.1,25.3
    			c20.6,16.1,41.2,36.1,61.2,59.5c-11.8,13.8-34.8,38.6-66,61.3c-60.1,43.7-120.8,59.5-180.3,46.9c-9.7-2.1-19.3,4.2-21.3,13.9
    			c-2.1,9.7,4.2,19.3,13.9,21.3c15.5,3.3,31.1,4.9,46.8,4.9c23.6,0,47.4-3.7,71.1-11.1c31.1-9.7,62-25.7,91.9-47.5
    			c50.4-36.9,80.5-77.6,81.8-79.3C491.367,249.011,491.167,240.011,486.067,233.611z"/>
    	</g>
    </g>
    <g>
    </g>
    <g>
    </g>
    <g>
    </g>
    <g>
    </g>
    <g>
    </g>
    <g>
    </g>
    <g>
    </g>
    <g>
    </g>
    <g>
    </g>
    <g>
    </g>
    <g>
    </g>
    <g>
    </g>
    <g>
    </g>
    <g>
    </g>
    <g>
    </g>
    </svg>

​

Answer 1

正如Andrew Morton在评论中所暗示的那样，g element是一个容器元素，用于将其他元素组合在一起，并将相同的属性应用于所有子元素。

在您的代码片段中，看起来SVG是使用Adobe Illustrator生成/导出的，这可能解释了所有空的<g>元素，可以安全地删除这些元素。实际上，代码中的所有<g>元素似乎都是多余的，没有它们也会产生相同的输出：

<svg version="1.1" id="Layer_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px" viewBox="0 0 490.034 490.034" style="enable-background:new 0 0 490.034 490.034;" xml:space="preserve">
    <path d="M435.667,54.311c-7-7.1-18.4-7-25.5,0l-64,64c-79.3-36-163.9-27.2-244.6,25.5c-60.1,39.2-96.6,88.5-98.1,90.6
        c-4.8,6.6-4.6,15.6,0.5,22c34.2,42,70,74.7,106.6,97.5l-56.3,56.3c-7,7-7,18.4,0,25.5c3.5,3.5,8.1,5.3,12.7,5.3s9.2-1.8,12.7-5.3
        l356-355.9C442.667,72.811,442.667,61.411,435.667,54.311z M200.467,264.011c-2.6-5.9-3.9-12.3-3.9-19c0-12.9,5-25.1,14.2-34.3
        c14.4-14.4,35.7-17.8,53.3-10.3L200.467,264.011z M290.667,173.911c-32.7-21-76.8-17.2-105.3,11.3c-16,16-24.7,37.2-24.7,59.7
        c0,16.4,4.7,32.1,13.4,45.6l-37.1,37.1c-32.5-18.8-64.5-46.6-95.6-82.9c13.3-15.6,41.4-45.7,79.9-70.8
        c66.6-43.4,132.9-52.8,197.5-28.1L290.667,173.911z"/>
    <path d="M486.067,233.611c-24.7-30.4-50.3-56-76.3-76.3c-7.9-6.1-19.2-4.7-25.4,3.1c-6.1,7.8-4.7,19.1,3.1,25.3
        c20.6,16.1,41.2,36.1,61.2,59.5c-11.8,13.8-34.8,38.6-66,61.3c-60.1,43.7-120.8,59.5-180.3,46.9c-9.7-2.1-19.3,4.2-21.3,13.9
        c-2.1,9.7,4.2,19.3,13.9,21.3c15.5,3.3,31.1,4.9,46.8,4.9c23.6,0,47.4-3.7,71.1-11.1c31.1-9.7,62-25.7,91.9-47.5
        c50.4-36.9,80.5-77.6,81.8-79.3C491.367,249.011,491.167,240.011,486.067,233.611z"/>
</svg>