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class="nav-link"><span class="title">微信小程序</span></a> <ul class="nav bd-sidenav level3" style="display:none"></ul></li><li class="nav-item"><a href="/handbook/zh/how-to/cross-platform/baidu-app" class="nav-link"><span class="title">百度智能小程序</span></a> <ul class="nav bd-sidenav level3" style="display:none"></ul></li></ul></li><li class="nav-item"><a class="nav-link"><span class="title">数据处理</span> <span class="glyphicon glyphicon-menu-up"></span></a> <ul class="nav bd-sidenav level2"><li class="nav-item"><a href="/handbook/zh/how-to/data/dynamic-data" aria-current="page" class="nav-link nuxt-link-exact-active nuxt-link-active"><span class="title">动态的异步数据</span></a> <ul class="nav bd-sidenav level3" style="display:none"></ul></li><!----></ul></li><li class="nav-item"><a class="nav-link"><span class="title">标签</span> <span class="glyphicon glyphicon-menu-down"></span></a> <ul class="nav bd-sidenav level2" style="display:none"><li class="nav-item"><a href="/handbook/zh/how-to/label/rich-text" class="nav-link"><span class="title">富文本标签</span></a> <ul class="nav bd-sidenav level3" style="display:none"></ul></li></ul></li><li class="nav-item"><a class="nav-link"><span class="title">动画</span> <span class="glyphicon glyphicon-menu-down"></span></a> <ul class="nav bd-sidenav level2" style="display:none"><li class="nav-item"><a href="/handbook/zh/how-to/animation/transition" class="nav-link"><span class="title">数据过渡动画</span></a> <ul class="nav bd-sidenav level3" style="display:none"></ul></li></ul></li><li class="nav-item"><a class="nav-link"><span class="title">交互</span> <span class="glyphicon glyphicon-menu-down"></span></a> <ul class="nav bd-sidenav level2" style="display:none"><li class="nav-item"><a href="/handbook/zh/how-to/interaction/drag" class="nav-link"><span class="title">拖拽的实现</span></a> <ul class="nav bd-sidenav level3" style="display:none"></ul></li><!----><li class="nav-item"><a href="/handbook/zh/how-to/interaction/coarse-pointer" class="nav-link"><span class="title">智能指针吸附</span></a> <ul class="nav bd-sidenav level3" style="display:none"></ul></li></ul></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-practices/canvas-vs-svg" class="nav-link"><span class="title">Canvas vs. SVG</span></a> <ul class="nav bd-sidenav level2" style="display:none"></ul></li><li class="nav-item"><a href="/handbook/zh/best-practices/aria" class="nav-link"><span class="title">无障碍访问</span></a> <ul class="nav bd-sidenav level2" style="display:none"></ul></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> <ul class="nav bd-sidenav level2" style="display:none"></ul></li></ul></li></ul></div> <div class="open-sidebar"><svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24" stroke="currentColor" class="h-6 w-6"><path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M9 5l7 7-7 7"></path></svg></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"><article><h1 id="%E5%BC%82%E6%AD%A5%E6%95%B0%E6%8D%AE%E7%9A%84%E5%8A%A0%E8%BD%BD%E4%B8%8E%E5%8A%A8%E6%80%81%E6%9B%B4%E6%96%B0" tabindex="-1">异步数据的加载与动态更新</h1> <h2 id="%E5%BC%82%E6%AD%A5%E5%8A%A0%E8%BD%BD" tabindex="-1">异步加载</h2> <p><a href="zh/get-started">入门示例</a>中的数据是在初始化后<code>setOption</code>中直接填入的，但是很多时候可能数据需要异步加载后再填入。<code>ECharts</code> 中实现异步数据的更新非常简单，在图表初始化后不管任何时候只要通过 jQuery 等工具异步获取数据后通过 <code>setOption</code> 填入数据和配置项就行。</p> <div class="md-code-block"><div class="nuxt-content-highlight"><pre class="language-js line-numbers"><code><span class="token keyword">var</span> myChart <span class="token operator">=</span> echarts<span class="token punctuation">.</span><span class="token function">init</span><span class="token punctuation">(</span>document<span class="token punctuation">.</span><span class="token function">getElementById</span><span class="token punctuation">(</span><span class="token string">'main'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| |
| $<span class="token punctuation">.</span><span class="token function">get</span><span class="token punctuation">(</span><span class="token string">'data.json'</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">done</span><span class="token punctuation">(</span><span class="token keyword">function</span><span class="token punctuation">(</span><span class="token parameter">data</span><span class="token punctuation">)</span> <span class="token punctuation">{</span> |
| <span class="token comment">// data 的结构:</span> |
| <span class="token comment">// {</span> |
| <span class="token comment">// categories: ["衬衫","羊毛衫","雪纺衫","裤子","高跟鞋","袜子"],</span> |
| <span class="token comment">// values: [5, 20, 36, 10, 10, 20]</span> |
| <span class="token comment">// }</span> |
| myChart<span class="token punctuation">.</span><span class="token function">setOption</span><span class="token punctuation">(</span><span class="token punctuation">{</span> |
| <span class="token literal-property property">title</span><span class="token operator">:</span> <span class="token punctuation">{</span> |
| <span class="token literal-property property">text</span><span class="token operator">:</span> <span class="token string">'异步数据加载示例'</span> |
| <span class="token punctuation">}</span><span class="token punctuation">,</span> |
| <span class="token literal-property property">tooltip</span><span class="token operator">:</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">,</span> |
| <span class="token literal-property property">legend</span><span class="token operator">:</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">,</span> |
| <span class="token literal-property property">xAxis</span><span class="token operator">:</span> <span class="token punctuation">{</span> |
| <span class="token literal-property property">data</span><span class="token operator">:</span> data<span class="token punctuation">.</span>categories |
| <span class="token punctuation">}</span><span class="token punctuation">,</span> |
| <span class="token literal-property property">yAxis</span><span class="token operator">:</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">,</span> |
| <span class="token literal-property property">series</span><span class="token operator">:</span> <span class="token punctuation">[</span> |
| <span class="token punctuation">{</span> |
| <span class="token literal-property property">name</span><span class="token operator">:</span> <span class="token string">'销量'</span><span class="token punctuation">,</span> |
| <span class="token literal-property property">type</span><span class="token operator">:</span> <span class="token string">'bar'</span><span class="token punctuation">,</span> |
| <span class="token literal-property property">data</span><span class="token operator">:</span> data<span class="token punctuation">.</span>values |
| <span class="token punctuation">}</span> |
| <span class="token punctuation">]</span> |
| <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span></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> <p>或者先设置完其它的样式，显示一个空的直角坐标轴，然后获取数据后填入数据。</p> <div class="md-code-block"><div class="nuxt-content-highlight"><pre class="language-js line-numbers"><code><span class="token keyword">var</span> myChart <span class="token operator">=</span> echarts<span class="token punctuation">.</span><span class="token function">init</span><span class="token punctuation">(</span>document<span class="token punctuation">.</span><span class="token function">getElementById</span><span class="token punctuation">(</span><span class="token string">'main'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| <span class="token comment">// 显示标题，图例和空的坐标轴</span> |
| myChart<span class="token punctuation">.</span><span class="token function">setOption</span><span class="token punctuation">(</span><span class="token punctuation">{</span> |
| <span class="token literal-property property">title</span><span class="token operator">:</span> <span class="token punctuation">{</span> |
| <span class="token literal-property property">text</span><span class="token operator">:</span> <span class="token string">'异步数据加载示例'</span> |
| <span class="token punctuation">}</span><span class="token punctuation">,</span> |
| <span class="token literal-property property">tooltip</span><span class="token operator">:</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">,</span> |
| <span class="token literal-property property">legend</span><span class="token operator">:</span> <span class="token punctuation">{</span> |
| <span class="token literal-property property">data</span><span class="token operator">:</span> <span class="token punctuation">[</span><span class="token string">'销量'</span><span class="token punctuation">]</span> |
| <span class="token punctuation">}</span><span class="token punctuation">,</span> |
| <span class="token literal-property property">xAxis</span><span class="token operator">:</span> <span class="token punctuation">{</span> |
| <span class="token literal-property property">data</span><span class="token operator">:</span> <span class="token punctuation">[</span><span class="token punctuation">]</span> |
| <span class="token punctuation">}</span><span class="token punctuation">,</span> |
| <span class="token literal-property property">yAxis</span><span class="token operator">:</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">,</span> |
| <span class="token literal-property property">series</span><span class="token operator">:</span> <span class="token punctuation">[</span> |
| <span class="token punctuation">{</span> |
| <span class="token literal-property property">name</span><span class="token operator">:</span> <span class="token string">'销量'</span><span class="token punctuation">,</span> |
| <span class="token literal-property property">type</span><span class="token operator">:</span> <span class="token string">'bar'</span><span class="token punctuation">,</span> |
| <span class="token literal-property property">data</span><span class="token operator">:</span> <span class="token punctuation">[</span><span class="token punctuation">]</span> |
| <span class="token punctuation">}</span> |
| <span class="token punctuation">]</span> |
| <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| |
| <span class="token comment">// 异步加载数据</span> |
| $<span class="token punctuation">.</span><span class="token function">get</span><span class="token punctuation">(</span><span class="token string">'data.json'</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">done</span><span class="token punctuation">(</span><span class="token keyword">function</span><span class="token punctuation">(</span><span class="token parameter">data</span><span class="token punctuation">)</span> <span class="token punctuation">{</span> |
| <span class="token comment">// 填入数据</span> |
| myChart<span class="token punctuation">.</span><span class="token function">setOption</span><span class="token punctuation">(</span><span class="token punctuation">{</span> |
| <span class="token literal-property property">xAxis</span><span class="token operator">:</span> <span class="token punctuation">{</span> |
| <span class="token literal-property property">data</span><span class="token operator">:</span> data<span class="token punctuation">.</span>categories |
| <span class="token punctuation">}</span><span class="token punctuation">,</span> |
| <span class="token literal-property property">series</span><span class="token operator">:</span> <span class="token punctuation">[</span> |
| <span class="token punctuation">{</span> |
| <span class="token comment">// 根据名字对应到相应的系列</span> |
| <span class="token literal-property property">name</span><span class="token operator">:</span> <span class="token string">'销量'</span><span class="token punctuation">,</span> |
| <span class="token literal-property property">data</span><span class="token operator">:</span> data<span class="token punctuation">.</span>data |
| <span class="token punctuation">}</span> |
| <span class="token punctuation">]</span> |
| <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span></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> <p>如下：</p> <p><iframe width="100%" height="350" src=""></iframe></p> <p>ECharts 中在更新数据的时候需要通过<code>name</code>属性对应到相应的系列，上面示例中如果<code>name</code>不存在也可以根据系列的顺序正常更新，但是更多时候推荐更新数据的时候加上系列的<code>name</code>数据。</p> <h2 id="loading-%E5%8A%A8%E7%94%BB" tabindex="-1">loading 动画</h2> <p>如果数据加载时间较长，一个空的坐标轴放在画布上也会让用户觉得是不是产生 bug 了，因此需要一个 loading 的动画来提示用户数据正在加载。</p> <p>ECharts 默认有提供了一个简单的加载动画。只需要调用 <a href="https://echarts.apache.org//api.html#echartsInstance.showLoading">showLoading</a> 方法显示。数据加载完成后再调用 <a href="https://echarts.apache.org//api.html#echartsInstance.hideLoading">hideLoading</a> 方法隐藏加载动画。</p> <div class="md-code-block"><div class="nuxt-content-highlight"><pre class="language-js line-numbers"><code>myChart<span class="token punctuation">.</span><span class="token function">showLoading</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| $<span class="token punctuation">.</span><span class="token function">get</span><span class="token punctuation">(</span><span class="token string">'data.json'</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">done</span><span class="token punctuation">(</span><span class="token keyword">function</span> <span class="token punctuation">(</span><span class="token parameter">data</span><span class="token punctuation">)</span> <span class="token punctuation">{</span> |
| myChart<span class="token punctuation">.</span><span class="token function">hideLoading</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| myChart<span class="token punctuation">.</span><span class="token function">setOption</span><span class="token punctuation">(</span><span class="token operator">...</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span></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> <p>效果如下：</p> <p><iframe width="100%" height="350" src=""></iframe></p> <h2 id="%E6%95%B0%E6%8D%AE%E7%9A%84%E5%8A%A8%E6%80%81%E6%9B%B4%E6%96%B0" tabindex="-1">数据的动态更新</h2> <p>ECharts 由数据驱动，数据的改变驱动图表展现的改变，因此动态数据的实现也变得异常简单。</p> <p>所有数据的更新都通过 <a href="https://echarts.apache.org//api.html#echartsInstance.setOption">setOption</a>实现，你只需要定时获取数据，<a href="~api.html#echartsInstance.setOption">setOption</a> 填入数据，而不用考虑数据到底产生了哪些变化，ECharts 会找到两组数据之间的差异然后通过合适的动画去表现数据的变化。</p> <p>具体可以看下面示例：</p> <p><iframe width="100%" height="350" src=""></iframe></p></article></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/how-to/data/dynamic-data.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/pissang" target="_blank" class="post-contributor"><img alt="pissang" src="https://avatars.githubusercontent.com/pissang?size=60" loading="lazy"> <span>pissang</span></a><a href="https://github.com/jishen027" target="_blank" class="post-contributor"><img alt="jishen027" src="https://avatars.githubusercontent.com/jishen027?size=60" loading="lazy"> <span>jishen027</span></a></div></div></div></div></div></div> <link rel="stylesheet" href="//fastly.jsdelivr.net/npm/highlight.js@9.12.0/styles/github-gist.min.css"></div></div></div></div><script>window.__NUXT__=function(t,i,e,d,r,a,l,n,o,h,c,s,g,C,p,I,A,m,u,B,b,E,f,G,y,S,L,v,w,k,O,W,Z,R,Y,X,D,x,H,K,P,F,Q,j,z,V,T,J,M,q,N,U,_,$,tt,it,et,dt){return{layout:"default",data:[{html:'<h1 id="%E5%BC%82%E6%AD%A5%E6%95%B0%E6%8D%AE%E7%9A%84%E5%8A%A0%E8%BD%BD%E4%B8%8E%E5%8A%A8%E6%80%81%E6%9B%B4%E6%96%B0" tabindex="-1">异步数据的加载与动态更新</h1>\n<h2 id="%E5%BC%82%E6%AD%A5%E5%8A%A0%E8%BD%BD" tabindex="-1">异步加载</h2>\n<p><a href="zh/get-started">入门示例</a>中的数据是在初始化后<code>setOption</code>中直接填入的，但是很多时候可能数据需要异步加载后再填入。<code>ECharts</code> 中实现异步数据的更新非常简单，在图表初始化后不管任何时候只要通过 jQuery 等工具异步获取数据后通过 <code>setOption</code> 填入数据和配置项就行。</p>\n<md-code-block lang="js" code="\'dmFyIG15Q2hhcnQgPSBlY2hhcnRzLmluaXQoZG9jdW1lbnQuZ2V0RWxlbWVudEJ5SWQoJ21haW4nKSk7CgokLmdldCgnZGF0YS5qc29uJykuZG9uZShmdW5jdGlvbihkYXRhKSB7CiAgLy8gZGF0YSDnmoTnu5PmnoQ6CiAgLy8gewogIC8vICAgICBjYXRlZ29yaWVzOiBbIuihrOihqyIsIue-iuavm-ihqyIsIumbque6uuihqyIsIuijpOWtkCIsIumrmOi3n-meiyIsIuiinOWtkCJdLAogIC8vICAgICB2YWx1ZXM6IFs1LCAyMCwgMzYsIDEwLCAxMCwgMjBdCiAgLy8gfQogIG15Q2hhcnQuc2V0T3B0aW9uKHsKICAgIHRpdGxlOiB7CiAgICAgIHRleHQ6ICflvILmraXmlbDmja7liqDovb3npLrkvosnCiAgICB9LAogICAgdG9vbHRpcDoge30sCiAgICBsZWdlbmQ6IHt9LAogICAgeEF4aXM6IHsKICAgICAgZGF0YTogZGF0YS5jYXRlZ29yaWVzCiAgICB9LAogICAgeUF4aXM6IHt9LAogICAgc2VyaWVzOiBbCiAgICAgIHsKICAgICAgICBuYW1lOiAn6ZSA6YePJywKICAgICAgICB0eXBlOiAnYmFyJywKICAgICAgICBkYXRhOiBkYXRhLnZhbHVlcwogICAgICB9CiAgICBdCiAgfSk7Cn0pOw\'" line-highlights="\'\'" />\n<p>或者先设置完其它的样式，显示一个空的直角坐标轴，然后获取数据后填入数据。</p>\n<md-code-block lang="js" code="\'dmFyIG15Q2hhcnQgPSBlY2hhcnRzLmluaXQoZG9jdW1lbnQuZ2V0RWxlbWVudEJ5SWQoJ21haW4nKSk7Ci8vIOaYvuekuuagh-mimO-8jOWbvuS-i-WSjOepuueahOWdkOagh-i9tApteUNoYXJ0LnNldE9wdGlvbih7CiAgdGl0bGU6IHsKICAgIHRleHQ6ICflvILmraXmlbDmja7liqDovb3npLrkvosnCiAgfSwKICB0b29sdGlwOiB7fSwKICBsZWdlbmQ6IHsKICAgIGRhdGE6IFsn6ZSA6YePJ10KICB9LAogIHhBeGlzOiB7CiAgICBkYXRhOiBbXQogIH0sCiAgeUF4aXM6IHt9LAogIHNlcmllczogWwogICAgewogICAgICBuYW1lOiAn6ZSA6YePJywKICAgICAgdHlwZTogJ2JhcicsCiAgICAgIGRhdGE6IFtdCiAgICB9CiAgXQp9KTsKCi8vIOW8guatpeWKoOi9veaVsOaNrgokLmdldCgnZGF0YS5qc29uJykuZG9uZShmdW5jdGlvbihkYXRhKSB7CiAgLy8g5aGr5YWl5pWw5o2uCiAgbXlDaGFydC5zZXRPcHRpb24oewogICAgeEF4aXM6IHsKICAgICAgZGF0YTogZGF0YS5jYXRlZ29yaWVzCiAgICB9LAogICAgc2VyaWVzOiBbCiAgICAgIHsKICAgICAgICAvLyDmoLnmja7lkI3lrZflr7nlupTliLDnm7jlupTnmoTns7vliJcKICAgICAgICBuYW1lOiAn6ZSA6YePJywKICAgICAgICBkYXRhOiBkYXRhLmRhdGEKICAgICAgfQogICAgXQogIH0pOwp9KTs\'" line-highlights="\'\'" />\n<p>如下：</p>\n<p><md-example src="doc-example/tutorial-async"></md-example></p>\n<p>ECharts 中在更新数据的时候需要通过<code>name</code>属性对应到相应的系列，上面示例中如果<code>name</code>不存在也可以根据系列的顺序正常更新，但是更多时候推荐更新数据的时候加上系列的<code>name</code>数据。</p>\n<h2 id="loading-%E5%8A%A8%E7%94%BB" tabindex="-1">loading 动画</h2>\n<p>如果数据加载时间较长，一个空的坐标轴放在画布上也会让用户觉得是不是产生 bug 了，因此需要一个 loading 的动画来提示用户数据正在加载。</p>\n<p>ECharts 默认有提供了一个简单的加载动画。只需要调用 <a href="https://echarts.apache.org//api.html#echartsInstance.showLoading">showLoading</a> 方法显示。数据加载完成后再调用 <a href="https://echarts.apache.org//api.html#echartsInstance.hideLoading">hideLoading</a> 方法隐藏加载动画。</p>\n<md-code-block lang="js" code="\'bXlDaGFydC5zaG93TG9hZGluZygpOwokLmdldCgnZGF0YS5qc29uJykuZG9uZShmdW5jdGlvbiAoZGF0YSkgewogICAgbXlDaGFydC5oaWRlTG9hZGluZygpOwogICAgbXlDaGFydC5zZXRPcHRpb24oLi4uKTsKfSk7\'" line-highlights="\'\'" />\n<p>效果如下：</p>\n<p><md-example src="doc-example/tutorial-loading"></md-example></p>\n<h2 id="%E6%95%B0%E6%8D%AE%E7%9A%84%E5%8A%A8%E6%80%81%E6%9B%B4%E6%96%B0" tabindex="-1">数据的动态更新</h2>\n<p>ECharts 由数据驱动，数据的改变驱动图表展现的改变，因此动态数据的实现也变得异常简单。</p>\n<p>所有数据的更新都通过 <a href="https://echarts.apache.org//api.html#echartsInstance.setOption">setOption</a>实现，你只需要定时获取数据，<a href="~api.html#echartsInstance.setOption">setOption</a> 填入数据，而不用考虑数据到底产生了哪些变化，ECharts 会找到两组数据之间的差异然后通过合适的动画去表现数据的变化。</p>\n<p>具体可以看下面示例：</p>\n<p><md-example src="doc-example/tutorial-dynamic-data"></md-example></p>\n',postPath:"zh/how-to/data/dynamic-data",title:"动态的异步数据 - 数据处理 - 应用篇"}],fetch:{},error:null,state:{filled:!1,docVersion:"",ghVersion:"",visibleAffix:!1,homepage:{},adBlocked:!1,focusMode:!1,posts:{zh:[{title:"快速上手",dir:d},{title:"入门篇",dir:r,children:[{title:"获取 ECharts",dir:a},{title:"在项目中引入 ECharts",dir:l},{title:"资源列表",dir:n,draft:t},{title:"寻求帮助",dir:o},{title:"版本特性",dir:h,children:[{title:"ECharts 5 特性介绍",dir:c},{title:"v4 升级 v5 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