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导出echarts中的图片
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2017-04-14
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<blockquote>
<p>echarts提供了很多精美图表插件，通过浏览器来渲染后，用户可以保存图表为图片。但是有些应用场景，需要在用户不打开浏览器的情况下，能把图表保存下来，比如把echarts图表插入到word文档中。这种需求下，我开发了echarts图片导出服务，并提供了相关接口。</p>
</blockquote>
<h3 id="提供了两种类型的接口："><a href="#提供了两种类型的接口：" class="headerlink" title="提供了两种类型的接口："></a>提供了两种类型的接口：</h3><h6 id="把定制页面的echarts图表保存为图片"><a href="#把定制页面的echarts图表保存为图片" class="headerlink" title="把定制页面的echarts图表保存为图片"></a>把定制页面的echarts图表保存为图片</h6><p>请求实例：<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div></pre></td><td class="code"><pre><div class="line">curl http://115.29.188.241:3100/ -d '{"url":"http://115.29.188.241/public/echarts/default.html","funcs":"salesChart,bubbleChart","delay":1000}'</div></pre></td></tr></table></figure></p>
<p>参数解释：</p>
<ul>
<li>请求接口：<a href="http://115.29.188.241:3100/" target="_blank" rel="external">http://115.29.188.241:3100/</a></li>
<li>请求方法：POST</li>
<li>请求参数：<ul>
<li>参数格式：JSON</li>
<li>url:定制的echarts图表页面，如：<a href="http://115.29.188.241/public/echarts/default.html" target="_blank" rel="external">http://115.29.188.241/public/echarts/default.html</a></li>
<li>funcs：上面指定的URL页面上暴露的echarts实例全局变量，多个实例用半角逗号隔开，如：salesChart,bubbleChart。<br><img src="http://ogcxhul17.bkt.clouddn.com/demo-sales.png" alt="sales"><br><img src="http://ogcxhul17.bkt.clouddn.com/demo-bubble.png" alt="bubble"></li>
<li>delay：可选项，单位ms，默认100，最大值5000。延时执行时间，有的echarts图表带有动画，需要等待动画执行完，delay时间越长，等待接口返回时间越长，建议关闭动画。</li>
</ul>
</li>
</ul>
<p>返回结果：<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div></pre></td><td class="code"><pre><div class="line">{"err":0,"msg":"success","imgs":{"bubbleChart":"http://saas-pubsentiment-img1.oss-cn-hangzhou.aliyuncs.com/2017/04/14/1492182803618.png","salesChart":"http://saas-pubsentiment-img1.oss-cn-hangzhou.aliyuncs.com/2017/04/14/1492183306861.png"}}</div></pre></td></tr></table></figure></p>
<p>出参解释：</p>
<ul>
<li>err： 0 或者 1 ， 0 表示没有错误，1表示发生错误。</li>
<li>msg： 成功返回success，失败返回错误的信息。</li>
<li>imgs：json对象，key为请求参数funcs中指定的全局变量名，比如这里的salesChart对应的图片为<a href="http://saas-pubsentiment-img1.oss-cn-hangzhou.aliyuncs.com/2017/04/14/1492183306861.png，bubbleChart对应的图片为http://saas-pubsentiment-img1.oss-cn-hangzhou.aliyuncs.com/2017/04/14/1492182803618.png" target="_blank" rel="external">http://saas-pubsentiment-img1.oss-cn-hangzhou.aliyuncs.com/2017/04/14/1492183306861.png，bubbleChart对应的图片为http://saas-pubsentiment-img1.oss-cn-hangzhou.aliyuncs.com/2017/04/14/1492182803618.png</a><br><img src="http://saas-pubsentiment-img1.oss-cn-hangzhou.aliyuncs.com/2017/04/14/1492183306861.png" alt="salesChart"><br><img src="http://saas-pubsentiment-img1.oss-cn-hangzhou.aliyuncs.com/2017/04/14/1492182803618.png" alt="bubbleChart"></li>
</ul>
<h6 id="根据echarts-option参数来生成图片，这里echarts的版本为3-5-3"><a href="#根据echarts-option参数来生成图片，这里echarts的版本为3-5-3" class="headerlink" title="根据echarts option参数来生成图片，这里echarts的版本为3.5.3"></a>根据echarts option参数来生成图片，这里echarts的版本为3.5.3</h6><p>请求实例：<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div></pre></td><td class="code"><pre><div class="line">curl http://115.29.188.241:3100/ -d '{"echartsOption":{"tooltip":{"trigger":"item","formatter":"{a} <br/>{b}: {c} ({d}%)"},"legend":{"orient":"vertical","x":"left","data":["直接访问","邮件营销","联盟广告","视频广告","搜索引擎"]},"series":[{"name":"访问来源","type":"pie","radius":["50%","70%"],"avoidLabelOverlap":false,"label":{"normal":{"show":false,"position":"center"},"emphasis":{"show":true,"textStyle":{"fontSize":"30","fontWeight":"bold"}}},"labelLine":{"normal":{"show":false}},"data":[{"value":335,"name":"直接访问"},{"value":310,"name":"邮件营销"},{"value":234,"name":"联盟广告"},{"value":135,"name":"视频广告"},{"value":1548,"name":"搜索引擎"}]}]},"width":600,"height":400}'</div></pre></td></tr></table></figure></p>
<p>参数解释：</p>
<ul>
<li>请求接口：<a href="http://115.29.188.241:3100/" target="_blank" rel="external">http://115.29.188.241:3100/</a></li>
<li>请求方法：POST</li>
<li>请求参数：<ul>
<li>参数格式：JSON</li>
<li>echartsOption：echarts的配置信息<br><img src="http://ogcxhul17.bkt.clouddn.com/demo-pie.png" alt="demo-pie"></li>
<li>width：可选项，生成图片的宽度，单位px，最大值：2000，默认值：600</li>
<li>height：可选项，生成图片的高度，单位px，最大值：2000，默认值：400<figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div></pre></td><td class="code"><pre><div class="line">{"err":0,"msg":"success","imgs":{"myChart":"http://saas-pubsentiment-img1.oss-cn-hangzhou.aliyuncs.com/2017/04/14/1492184722716.png"}}</div></pre></td></tr></table></figure>
</li>
</ul>
</li>
</ul>
<p>出参解释：</p>
<ul>
<li>err： 0 或者 1 ， 0 表示没有错误，1表示发生错误。</li>
<li>msg： 成功返回success，失败返回错误的信息。</li>
<li>imgs：这里的key固定为myChart<br><img src="http://saas-pubsentiment-img1.oss-cn-hangzhou.aliyuncs.com/2017/04/14/1492184722716.png" alt="demo-pie"></li>
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