javascript - 将 svg 转换为 base64

Question

以编程方式创建的 SVG 无法正确转换为 base64。

在我的应用程序中，我有一个服务，它通过 g-element 获得响应，然后放入创建的 svg-element 并将其转换为 base64，但是如果我尝试打开一个链接，我发现 svg 不会呈现在页面。

    var xmlns = 'http://www.w3.org/2000/svg',
    IMAGE_TEMPLATE = document.createElementNS(xmlns, 'svg');
    IMAGE_TEMPLATE.appendChild(document.body.querySelector('#ico-appliance-thermostat-128'));
    IMAGE_TEMPLATE.setAttribute('id', 'svg');

    IMAGE_TEMPLATE.setAttributeNS(null, 'width', 128);
    IMAGE_TEMPLATE.setAttributeNS(null, 'height', 128);
    IMAGE_TEMPLATE.setAttributeNS(null, 'viewBox', '0 0 128 128');

    document.body.querySelector('#test').appendChild(IMAGE_TEMPLATE);

    test = function(){
        var s = new XMLSerializer().serializeToString(document.getElementById("svg"))
        var encodedData = window.btoa(s);
        console.log('data:image/svg+xml;base64,' + encodedData);
    }

https://jsfiddle.net/6sra5c5L/

Answer 1

尝试添加 <svg></svg>周围<g>元素，关闭 }在test功能 ;定义 test作为命名函数

    var xmlns = 'http://www.w3.org/2000/svg',
      IMAGE_TEMPLATE = document.createElementNS(xmlns, 'svg');
    IMAGE_TEMPLATE.appendChild(document.body.querySelector('#ico-appliance-thermostat-128'));
    IMAGE_TEMPLATE.setAttribute('id', 'svg');
    IMAGE_TEMPLATE.setAttributeNS(null, 'width', 128);
    IMAGE_TEMPLATE.setAttributeNS(null, 'height', 128);
    IMAGE_TEMPLATE.setAttributeNS(null, 'viewBox', '0 0 128 128');

    document.body.querySelector('#test').appendChild(IMAGE_TEMPLATE);

    function test() {
      var s = new XMLSerializer().serializeToString(document.getElementById("svg"))
      console.log(document.getElementById("svg"))
      console.log(s)
      var encodedData = window.btoa(s);
      console.log('data:image/svg+xml;base64,' + encodedData);
    }

<svg>
  <g id="ico-appliance-thermostat-128" transform="scale(2)">
    <path d="M106.949,128.009 L105.294,124.692 C115.967,119.333 123.298,108.278 123.298,95.500 C123.298,82.722 115.967,71.666 105.294,66.308 L106.949,62.990 C118.835,68.958 126.999,81.270 126.999,95.500 C126.999,109.730 118.835,122.042 106.949,128.009 ZM117.376,95.500 C117.376,105.954 111.378,115.000 102.645,119.384 L100.990,116.067 C108.510,112.292 113.676,104.502 113.676,95.500 C113.676,86.497 108.510,78.708 100.990,74.933 L102.645,71.615 C111.378,76.000 117.376,85.045 117.376,95.500 ZM106.999,95.213 C106.999,98.063 104.756,100.373 101.988,100.373 C100.251,100.373 98.720,99.462 97.822,98.080 L91.490,98.080 L85.840,116.427 L85.662,116.427 L85.840,117.000 L80.829,117.000 L70.082,82.422 L65.795,97.506 L65.795,98.080 L54.999,98.080 L54.999,92.920 L62.087,92.920 L67.465,74.000 L72.477,74.000 L83.234,108.615 L88.067,92.920 L89.738,92.920 L93.079,92.920 L97.504,92.920 C98.324,91.222 100.021,90.053 101.988,90.053 C104.756,90.053 106.999,92.363 106.999,95.213 ZM24.999,128.000 C11.787,128.000 0.999,117.189 0.999,103.993 C0.999,96.779 4.177,90.380 8.986,85.988 C8.986,85.173 8.986,84.776 8.986,83.981 L8.986,15.997 C8.986,7.193 16.177,-0.000 24.979,-0.000 C33.780,-0.000 40.972,7.193 40.972,15.997 L40.972,83.981 C40.972,84.796 40.972,85.194 40.972,85.988 C45.780,90.380 48.979,96.779 48.999,103.993 C48.999,117.210 38.212,128.000 24.999,128.000 ZM33.999,90.000 L33.999,17.000 C33.999,12.373 29.662,8.009 24.988,8.009 C20.314,8.009 16.000,12.373 16.000,17.000 L16.000,90.000 C10.903,92.952 7.985,97.813 7.985,104.136 C7.985,113.411 15.641,120.990 25.011,120.990 C34.380,120.990 42.037,113.389 41.992,104.114 C41.992,97.791 39.118,92.952 33.999,90.000 ZM24.999,112.990 C19.904,112.990 15.999,109.082 15.999,103.983 C15.999,100.092 18.383,96.796 21.989,95.588 C21.989,95.290 21.989,95.290 21.989,94.992 L21.989,38.991 C21.989,37.500 23.181,35.994 24.984,35.994 C26.787,35.994 27.979,37.187 27.979,38.991 L27.979,95.008 C27.979,95.306 27.979,95.306 27.979,95.604 C31.585,96.812 33.984,100.107 33.999,103.983 C33.999,109.082 30.095,112.990 24.999,112.990 Z"
    style="fill: #5aac21;fill-rule: evenodd;"></path>
  </g>
</svg>
<div id="test"></div>
<button onclick="test()">Test</button>

jsfiddle https://jsfiddle.net/6sra5c5L/5/