使用无法在 Safari 中工作的图像转换 SVG
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【中文标题】使用无法在 Safari 中工作的图像转换 SVG【英文标题】：Convert SVG with image not working in safari 【发布时间】：2021-12-25 04:38:58 【问题描述】：我想将带有图像的 SVG 转换为 png。 在 Firefox 和 Chrome 中一切正常，但在 Safari 中，转换忽略了 SVG 中的图像。
我使用的库是 html-to-image（html2canvas 给了我同样的结果）
这是一个codepen（脸就是图像） https://codepen.io/RainPara/pen/MWvqZNz
var node = document.getElementById('item');
htmlToImage.toPng(node)
.then(function (dataUrl)
var img = new Image();
img.src = dataUrl;
document.body.appendChild(img);
)
.catch(function (error)
console.error('oops, something went wrong!', error);
);
也许有人可以帮助我
【问题讨论】：
你把它标记为画布，但你没有使用画布，***.com/search?q=svg+png+canvas 抱歉，我改了 【参考方案1】：在 ios safari(v15) 上测试你的例子，我也遇到了这个问题。
基本上，svg到图片的转换过程包括：
-
创建 Blob/Blob URL（另请参阅 What is a blob URL and why it is used?）
将其渲染到画布上
返回一个数据url
由于某些原因（至少是某些）Safari 版本，显然需要一些延迟才能正确渲染画布。
本示例使用了最初使用的 html2canvas（基于库/脚本）和精简的 js 代码。
function save()
var node = document.getElementById("item");
htmlToImage
.toPng(node)
.then(function (dataUrl)
var img = new Image();
//img.width = nodeW;
//img.height = nodeH;
img.src = dataUrl;
let imgWrp = document.createElement("div");
imgWrp.classList.add("img-wrp");
imgWrp.appendChild(img);
document.body.appendChild(imgWrp);
)
.catch(function (error)
console.error("oops, something went wrong!", error);
);
function svg2Png(selector)
const svgEl = document.querySelector(selector);
let svgBB = svgEl.getBBox();
let svgW = svgBB.width;
let svgH = svgBB.height;
let blob = new Blob([svgEl.outerHTML], type: 'image/svg+xml');
let URL = window.URL;
let blobURL = URL.createObjectURL(blob);
let tmpImg = new Image();
tmpImg.src = blobURL;
tmpImg.width = svgW;
tmpImg.height = svgH;
tmpImg.onload = () =>
let canvas = document.createElement("canvas");
canvas.width = svgW;
canvas.height = svgH;
let context = canvas.getContext("2d");
// draw blob img to canvas with some delay
setTimeout(function ()
context.drawImage(tmpImg, 0, 0, svgW, svgH);
let pngDataUrl = canvas.toDataURL();
let svgImg = document.createElement("img");
svgImg.width = svgW;
svgImg.height = svgH;
svgImg.class = "svgImg";
svgImg.src = pngDataUrl;
// just additional wrapping for example usage
let imgWrp = document.createElement("div");
imgWrp.setAttribute("class", "img-wrp img-wrp-vanilla");
imgWrp.appendChild(svgImg);
document.body.appendChild(imgWrp);
, 300);
;
.btn-wrp
display:flex;
button
width:100%;
padding:0.5em;
.img-wrp
display:inline-block;
font-size:25vw;
width:1em;
height: 1em;
border: 2px solid green
.img-wrp-svg
border: 2px solid red
.img-wrp-vanilla
border: 2px solid orange
.img-wrp>*
width:100%;
height:auto;
img
/*
display:inline-block;
font-size:10em;
width:1em;
height: 1em;
*/
<script src="https://cdnjs.cloudflare.com/ajax/libs/html-to-image/1.9.0/html-to-image.js"></script>
<div class="btn-wrp">
<button type="button" onclick="save()">Convert svg (html-to-image.js)</button>
<button type="button" onclick="svg2Png('svg')">svg2Png</button>
</div>
<div class="img-wrp img-wrp-svg">
<svg id="item" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 500 500">
<defs>
<mask id="a" x="197" y="42" maskUnits="userSpaceOnUse">
<g data-name="c">
<path data-name="b" d="M301 92c-7-8-13-17-39-19-28-2-36 8-44 19s-24-28-19-33c10-10 35-18 59-16 42 3 71 24 66 36s-19 19-23 13Z" fill="#fff" />
</g>
</mask>
<mask id="b" x="184" y="42" maskUnits="userSpaceOnUse">
<g data-name="c">
<path data-name="b" d="M301 92c-7-8-13-17-39-19-28-2-36 8-44 19s-24-28-19-33c10-10 35-18 59-16 42 3 71 24 66 36s-19 19-23 13Z" fill="#fff" />
</g>
</mask>
<mask id="c" x="198" y="42" maskUnits="userSpaceOnUse">
<g data-name="c">
<path data-name="b" d="M301 92c-7-8-13-17-39-19-28-2-36 8-44 19s-24-28-19-33c10-10 35-18 59-16 42 3 71 24 66 36s-19 19-23 13Z" fill="#fff" />
</g>
</mask>
<mask id="d" x="195" y="42" maskUnits="userSpaceOnUse">
<g data-name="c">
<path data-name="b" d="M301 92c-7-8-13-17-39-19-28-2-36 8-44 19s-24-28-19-33c10-10 35-18 59-16 42 3 71 24 66 36s-19 19-23 13Z" fill="#fff" />
</g>
</mask>
</defs>
<path d="M0 0h500v500H0Z" fill="none"/>
<path d="M410 471c0 16-74 29-166 29S78 487 78 471s75-29 166-29 166 13 166 29" style="isolation:isolate" opacity=".2"/>
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<path d="M301 92c-7-8-13-17-39-19-28-2-36 8-44 19s-24-28-19-33c10-10 35-18 59-16 42 3 71 24 66 36s-19 19-23 13Z" fill="#f0f0f0" />
<g mask="url(#a)">
<path d="M197 83c3-9 12-17 22-19a32 32 0 0 1 5-1c-7-1-13-1-18 3-7 3-9 10-9 17Z" fill="#fff" />
</g>
<g mask="url(#b)">
<path d="M257 47c-31-1-49 6-59 14h-1v1a40 40 0 0 0-4 4c-5 5-8 14-9 22-1 6 0 12 2 15 0-5 4-9 8-13-2-13 0-25 14-30 7-2 14-1 21 0 12 2 21-5 32-7 9-2 17 0 25 4l17 8 14 4h1l-3-2a108 108 0 0 0-58-20Z" fill="#fff" />
</g>
<g mask="url(#c)">
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</g>
<g mask="url(#c)">
<path d="M300 87c8 1 15-3 18-12 1-3-1-5-3-8l-1-1c2 7 0 11-5 16-5 3-11 3-16 2l-38-8c-14-3-29-4-43 0a35 35 0 0 0-12 4c15-8 35-6 52-4 16 2 32 8 48 11Z" fill="#d4d4d4" />
</g>
<g mask="url(#d)">
<path d="M320 71c3 11-7 21-21 18l-23-4c-12-3-24-5-37-6-16-1-33-1-44 10 5-3 69-11 113 9q15 1 20 7c3-4 6-16 0-25a43 43 0 0 0-8-9Z" fill="#d4d4d4" />
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</svg>
</div>使用的自定义函数svg2Png() 只是一个简单的示例代码，可能不适合提供最好的旧版浏览器支持。
因此，请考虑在 github 上发布“html2canvas”（或其他使用过的库）的问题报告。
【讨论】：
哇，你是英雄！！！昨天我按两次保存按钮时偶然发现了一个想法。突然它起作用了，所以我的解决方案是简单地自动执行该功能两次，并有一个小的超时。但由于没有正确编程，我一直对这个解决方案不满意。 你是怎么想到延迟的？如果不是我的巧合，那我永远也找不到“解决方案” 我注意到刷新页面后转换工作正常（所以如果应用了一些页面缓存）。对于较小的不太复杂的图像，这可能可以忽略不计。以上是关于使用无法在 Safari 中工作的图像转换 SVG的主要内容，如果未能解决你的问题，请参考以下文章
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