html5 svg没有显示

我是html5 svg渲染新手。我试过这个：

<svg width="200" height="200"> 
    <symbol viewBox="0 0 64 64" id="shape-phone">
        <title>phone</title> 
        <g> 
            <rect x="16" y="1" fill="none" stroke-width="2" stroke-miterlimit="10" width="32" height="62"/> 
            <line fill="none" stroke-width="2" stroke-miterlimit="10" x1="28" y1="5" x2="36" y2="5"/> 
            <line fill="none" stroke-width="2" stroke-miterlimit="10" x1="16" y1="51" x2="48" y2="51"/> 
            <line fill="none" stroke-width="2" stroke-miterlimit="10" x1="16" y1="9" x2="48" y2="9"/> 
            <circle fill="none" stroke-width="2" stroke-linejoin="bevel" stroke-miterlimit="10" cx="32" cy="57" r="2"/> 
        </g> 
    </symbol>
</svg>

您定义了一个

，但需要用

显示它：

<use xlink:href="#shape-phone" x="0" y="0" width="64" height="64" />

符号未显示，因为未设置

笔划

<svg width="200" height="200" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 200 200" xmlns="http://www.w3.org/2000/svg"> 
  <symbol viewBox="0 0 64 64" id="shape-phone">
    <g> 
        <rect x="16" y="1" stroke="#00ff00" fill="none" stroke-width="2" stroke-miterlimit="10" width="32" height="62"/> 
        <line fill="none" stroke="#00ff00" stroke-width="2" stroke-miterlimit="10" x1="28" y1="5" x2="36" y2="5"/> 
        <line fill="none" stroke="#00ff00" stroke-width="2" stroke-miterlimit="10" x1="16" y1="51" x2="48" y2="51"/> 
        <line fill="none" stroke="#00ff00" stroke-width="2" stroke-miterlimit="10" x1="16" y1="9" x2="48" y2="9"/> 
        <circle fill="none" stroke="#00ff00" stroke-width="2" stroke-linejoin="bevel" stroke-miterlimit="10" cx="32" cy="57" r="2"/> 
    </g> 
  </symbol>
  <use xlink:href="#shape-phone" x="0" y="0" />
</svg>



您定义了一个
，但需要用
显示它：

<use xlink:href="#shape-phone" x="0" y="0" width="64" height="64" />

符号未显示，因为未设置
笔划

<svg width="200" height="200" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 200 200" xmlns="http://www.w3.org/2000/svg"> 
  <symbol viewBox="0 0 64 64" id="shape-phone">
    <g> 
        <rect x="16" y="1" stroke="#00ff00" fill="none" stroke-width="2" stroke-miterlimit="10" width="32" height="62"/> 
        <line fill="none" stroke="#00ff00" stroke-width="2" stroke-miterlimit="10" x1="28" y1="5" x2="36" y2="5"/> 
        <line fill="none" stroke="#00ff00" stroke-width="2" stroke-miterlimit="10" x1="16" y1="51" x2="48" y2="51"/> 
        <line fill="none" stroke="#00ff00" stroke-width="2" stroke-miterlimit="10" x1="16" y1="9" x2="48" y2="9"/> 
        <circle fill="none" stroke="#00ff00" stroke-width="2" stroke-linejoin="bevel" stroke-miterlimit="10" cx="32" cy="57" r="2"/> 
    </g> 
  </symbol>
  <use xlink:href="#shape-phone" x="0" y="0" />
</svg>