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class="title">入门篇</span></div> <ul class="nav bd-sidenav level1"><li class="nav-item"><a href="/handbook/zh/basics/download" class="nav-link"><span class="title">获取 ECharts</span></a> <!----></li><li class="nav-item"><a href="/handbook/zh/basics/import" class="nav-link"><span class="title">在项目中引入 ECharts</span></a> <!----></li><!----><li class="nav-item"><a href="/handbook/zh/basics/inspiration" class="nav-link"><span class="title">获取灵感</span></a> <!----></li><li class="nav-item"><a href="/handbook/zh/basics/help" class="nav-link"><span class="title">寻求帮助</span></a> <!----></li><li class="nav-item"><a class="nav-link"><span class="title">版本介绍</span> <span class="glyphicon glyphicon-menu-down"></span></a> <!----></li></ul></li><li class="nav-item"><div class="nav-link"><span class="title">概念篇</span></div> <ul class="nav bd-sidenav level1"><li class="nav-item"><a href="/handbook/zh/concepts/chart-size" class="nav-link"><span class="title">图表容器及大小</span></a> <!----></li><!----><!----><li class="nav-item"><a href="/handbook/zh/concepts/style" class="nav-link"><span class="title">样式</span></a> <!----></li><li class="nav-item"><a href="/handbook/zh/concepts/dataset" class="nav-link"><span class="title">数据集</span></a> <!----></li><li class="nav-item"><a href="/handbook/zh/concepts/data-transform" class="nav-link"><span class="title">数据转换</span></a> <!----></li><!----><li class="nav-item"><a href="/handbook/zh/concepts/axis" class="nav-link"><span class="title">坐标轴</span></a> <!----></li><li class="nav-item"><a href="/handbook/zh/concepts/visual-map" class="nav-link"><span class="title">视觉映射</span></a> <!----></li><li class="nav-item"><a href="/handbook/zh/concepts/legend" class="nav-link"><span class="title">图例</span></a> <!----></li><li class="nav-item"><a href="/handbook/zh/concepts/event" class="nav-link"><span class="title">事件与行为</span></a> <!----></li></ul></li><li class="nav-item"><div class="nav-link"><span class="title">应用篇</span></div> <ul class="nav bd-sidenav level1"><li class="nav-item"><a class="nav-link"><span class="title">常用图表类型</span> <span class="glyphicon glyphicon-menu-down"></span></a> <!----></li><!----><li class="nav-item"><a class="nav-link"><span class="title">跨平台方案</span> <span class="glyphicon glyphicon-menu-down"></span></a> <!----></li><li class="nav-item"><a class="nav-link"><span class="title">数据处理</span> <span class="glyphicon glyphicon-menu-down"></span></a> <!----></li><li class="nav-item"><a class="nav-link"><span class="title">标签</span> <span class="glyphicon glyphicon-menu-down"></span></a> <!----></li><li class="nav-item"><a class="nav-link"><span class="title">交互</span> <span class="glyphicon glyphicon-menu-down"></span></a> <!----></li></ul></li><li class="nav-item"><div class="nav-link"><span class="title">最佳实践</span></div> <ul class="nav bd-sidenav level1"><!----><li class="nav-item"><a href="/handbook/zh/best-practice/canvas-vs-svg" aria-current="page" class="nav-link nuxt-link-exact-active nuxt-link-active"><span class="title">Canvas vs. SVG</span></a> <!----></li><li class="nav-item"><a href="/handbook/zh/best-practice/aria" class="nav-link"><span class="title">无障碍访问</span></a> <!----></li></ul></li><li class="nav-item"><div class="nav-link"><span class="title">编辑本文档</span></div> <ul class="nav bd-sidenav level1"><li class="nav-item"><a href="/handbook/zh/meta/edit-guide" class="nav-link"><span class="title">文档编辑指南</span></a> <!----></li></ul></li></ul></div></div> <div class="bd-content col-sm-7 pl-sm-2 col-12"><div class="post-content content"><div><div class="post-inner"><div class="nuxt-content"><h1 id="使用-canvas-或者-svg-渲染"><a href="#%E4%BD%BF%E7%94%A8-canvas-%E6%88%96%E8%80%85-svg-%E6%B8%B2%E6%9F%93" aria-hidden="true" tabindex="-1"><span class="icon icon-link"></span></a>使用 Canvas 或者 SVG 渲染</h1>
<p>浏览器端图表库大多会选择 SVG 或者 Canvas 进行渲染。对于绘制图表来说,这两种技术往往是可替换的,效果相近。但是在一些场景中,他们的表现和能力又有一定差异。于是,对它们的选择取舍,就成为了一个一直存在的不易有标准答案的话题。</p>
<p>ECharts 从初始一直使用 Canvas 绘制图表。而 <a href="https://github.com/apache/echarts/releases" rel="nofollow noopener noreferrer" target="_blank">ECharts v4.0</a> 发布了 SVG 渲染器,从而提供了一种新的选择。只须在初始化一个图表实例时,设置 <a href="https://echarts.apache.org//api.html#echarts.init" rel="nofollow noopener noreferrer" target="_blank">renderer 参数</a><code>'canvas'</code><code>'svg'</code> 即可指定渲染器,比较方便。</p>
<blockquote>
<p>SVG 和 Canvas 这两种使用方式差异很大的技术,能够做到同时被透明支持,主要归功于 ECharts 底层库 <a href="https://github.com/ecomfe/zrender" rel="nofollow noopener noreferrer" target="_blank">ZRender</a> 的抽象和实现,形成可互换的 SVG 渲染器和 Canvas 渲染器。</p>
</blockquote>
<h2 id="选择哪种渲染器"><a href="#%E9%80%89%E6%8B%A9%E5%93%AA%E7%A7%8D%E6%B8%B2%E6%9F%93%E5%99%A8" aria-hidden="true" tabindex="-1"><span class="icon icon-link"></span></a>选择哪种渲染器</h2>
<p>一般来说,Canvas 更适合绘制图形元素数量较多(这一般是由数据量大导致)的图表(如热力图、地理坐标系或平行坐标系上的大规模线图或散点图等),也利于实现某些视觉 <a href="https://echarts.apache.org//examples/editor.html?c=lines-bmap-effect" rel="nofollow noopener noreferrer" target="_blank">特效</a>。但是,在不少场景中,SVG 具有重要的优势:它的内存占用更低(这对移动端尤其重要)、并且用户使用浏览器内置的缩放功能时不会模糊。</p>
<p>选择哪种渲染器,我们可以根据软硬件环境、数据量、功能需求综合考虑。</p>
<ul>
<li>在软硬件环境较好,数据量不大的场景下,两种渲染器都可以适用,并不需要太多纠结。</li>
<li>在环境较差,出现性能问题需要优化的场景下,可以通过试验来确定使用哪种渲染器。比如有这些经验:
<ul>
<li>在须要创建很多 ECharts 实例且浏览器易崩溃的情况下(可能是因为 Canvas 数量多导致内存占用超出手机承受能力),可以使用 SVG 渲染器来进行改善。大略得说,如果图表运行在低端安卓机,或者我们在使用一些特定图表如 <a href="https://ecomfe.github.io/echarts-liquidfill/example/" rel="nofollow noopener noreferrer" target="_blank">水球图</a> 等,SVG 渲染器可能效果更好。</li>
<li>数据量较大(经验判断 > 1k)、较多交互时,建议选择 Canvas 渲染器。</li>
</ul>
</li>
</ul>
<p>我们强烈欢迎开发者们<a href="https://github.com/apache/echarts/issues/new" rel="nofollow noopener noreferrer" target="_blank">反馈</a>给我们使用的体验和场景,帮助我们更好的做优化。</p>
<p>注:当前某些特殊的渲染依然需要依赖 Canvas:如<a href="https://echarts.apache.org/option.html#series-lines.effect" rel="nofollow noopener noreferrer" target="_blank">炫光尾迹特效</a><a href="https://echarts.apache.org//examples/editor.html?c=heatmap-bmap" rel="nofollow noopener noreferrer" target="_blank">带有混合效果的热力图</a>等。</p>
<h2 id="如何使用渲染器"><a href="#%E5%A6%82%E4%BD%95%E4%BD%BF%E7%94%A8%E6%B8%B2%E6%9F%93%E5%99%A8" aria-hidden="true" tabindex="-1"><span class="icon icon-link"></span></a>如何使用渲染器</h2>
<p>如果是用如下的方式完整引入<code>echarts</code>,代码中已经包含了 SVG 渲染器和 Canvas 渲染器</p>
<div class="nuxt-content-highlight"><div class="md-code-block"><div class="nuxt-content-highlight"><pre class="language-js line-numbers"><code></code></pre></div> <!----> <div class="clipboard" data-v-479657ca><svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24" stroke="currentColor" class="h-6 w-6" data-v-479657ca><svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24" stroke="currentColor" class="h-6 w-6" data-v-479657ca><path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M8 5H6a2 2 0 00-2 2v12a2 2 0 002 2h10a2 2 0 002-2v-1M8 5a2 2 0 002 2h2a2 2 0 002-2M8 5a2 2 0 012-2h2a2 2 0 012 2m0 0h2a2 2 0 012 2v3m2 4H10m0 0l3-3m-3 3l3 3" data-v-479657ca></path></svg></svg></div></div></div>
<p>如果你是按照 <a href="zh/basics/import">在项目中引入 Apache ECharts</a> 一文中的介绍使用按需引入,则需要手动引入需要的渲染器</p>
<div class="nuxt-content-highlight"><div class="md-code-block"><div class="nuxt-content-highlight"><pre class="language-js line-numbers"><code></code></pre></div> <!----> <div class="clipboard" data-v-479657ca><svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24" stroke="currentColor" class="h-6 w-6" data-v-479657ca><svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24" stroke="currentColor" class="h-6 w-6" data-v-479657ca><path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M8 5H6a2 2 0 00-2 2v12a2 2 0 002 2h10a2 2 0 002-2v-1M8 5a2 2 0 002 2h2a2 2 0 002-2M8 5a2 2 0 012-2h2a2 2 0 012 2m0 0h2a2 2 0 012 2v3m2 4H10m0 0l3-3m-3 3l3 3" data-v-479657ca></path></svg></svg></div></div></div>
<p>然后,我们就可以在代码中,初始化图表实例时,<a href="https://echarts.apache.org//api.html/api.html#echarts.init" rel="nofollow noopener noreferrer" target="_blank">传入参数</a> 选择渲染器类型:</p>
<div class="nuxt-content-highlight"><div class="md-code-block"><div class="nuxt-content-highlight"><pre class="language-js line-numbers"><code></code></pre></div> <!----> <div class="clipboard" data-v-479657ca><svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24" stroke="currentColor" class="h-6 w-6" data-v-479657ca><svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24" stroke="currentColor" class="h-6 w-6" data-v-479657ca><path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M8 5H6a2 2 0 00-2 2v12a2 2 0 002 2h10a2 2 0 002-2v-1M8 5a2 2 0 002 2h2a2 2 0 002-2M8 5a2 2 0 012-2h2a2 2 0 012 2m0 0h2a2 2 0 012 2v3m2 4H10m0 0l3-3m-3 3l3 3" data-v-479657ca></path></svg></svg></div></div></div></div> <div class="table-of-contents"><h4 class="toc-container-header">本页目录</h4> <ul><li class="toc2"><a href="/handbook/zh/best-practice/canvas-vs-svg#%E9%80%89%E6%8B%A9%E5%93%AA%E7%A7%8D%E6%B8%B2%E6%9F%93%E5%99%A8">选择哪种渲染器</a></li><li class="toc2"><a href="/handbook/zh/best-practice/canvas-vs-svg#%E5%A6%82%E4%BD%95%E4%BD%BF%E7%94%A8%E6%B8%B2%E6%9F%93%E5%99%A8">如何使用渲染器</a></li></ul></div></div> <div class="post-contributors"><h3><span class="inline-block align-middle">本文贡献者</span> <a target="_blank" href="https://github.com/apache/echarts-handbook/tree/master/contents/zh/best-practice/canvas-vs-svg.md" title="编辑本文" class="inline-block align-middle text-sm"><svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24" stroke="currentColor" class="h-8 w-8 inline-block align-middle"><path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M11 5H6a2 2 0 00-2 2v11a2 2 0 002 2h11a2 2 0 002-2v-5m-1.414-9.414a2 2 0 112.828 2.828L11.828 15H9v-2.828l8.586-8.586z"></path></svg> <span class="inline-block align-middle">在 GitHub 上编辑本页</span></a></h3> <div class="post-contributors-list"><a href="https://github.com/Ovilia" target="_blank" class="post-contributor"><img alt="Ovilia" src="https://avatars.githubusercontent.com/Ovilia?size=60"> <span>Ovilia</span></a></div></div></div></div></div></div> <link rel="stylesheet" href="//cdn.jsdelivr.net/npm/highlight.js@9.12.0/styles/github-gist.min.css"></div></div></div></div><script defer src="/handbook/_nuxt/static/1627882506/zh/best-practice/canvas-vs-svg/state.js"></script><script src="/handbook/_nuxt/b6d3b58.js" defer></script><script src="/handbook/_nuxt/js/11b97ca97d591d9fd371.js" defer></script><script src="/handbook/_nuxt/js/5e2cbf163a319fa7cf5b.js" defer></script><script src="/handbook/_nuxt/js/f5e7518d240a121a2e4a.js" defer></script><script src="/handbook/_nuxt/js/4c789e610fc01b03106d.js" defer></script><script src="/handbook/_nuxt/js/25eb9ce4c1818917d228.js" defer></script>
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