Comments (8)
其实并不需要这么比喻,直接说具体问题也许更加容易懂。
你 setState 之后肯定会重新 render,但是有 option 并没有变化,所以图形上感觉不到区别。你可以尝试加一些动画试试看。
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@hustcc thank you. 对,我知道图没有变化,但是实际上echart 做了render这个动作。我的目标是不让echart做render。
一个图感觉不明显,如果页面有20几个的话,页面就会hang住。。。。。
现在我的做法是写了一个shouldupdate来判断数据,想看看有没有其它办法。
因为感觉react并没有控制echart.init出来的那个div里的canvas
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我理解的你的意思了,如果按照我这里组件代码:
componentDidUpdate() {
this.renderEchartDom();
this.bindEvents(this.getEchartsInstance(), this.props.onEvents || []);
},
只有 componentDidUpdate 的时候才会触发重新渲染,我来测试一下,如果外部组件 state 变化,但是ReactEcharts 的属性不变化的情况下,看会不会触发图表渲染。
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https://medium.com/@arikmaor/react-redux-performance-tuning-tips-cef1a6c50759#.f9uq92zhu
按照这个文章说的,react首先生成virtual dom,然后比较前后两个virtual dom.
我觉得react就认为
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<div><canvas></canvas></div>
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我加入 30 个 charts,每秒刷一次,确实有卡顿的感觉。
如果我这边添加 shouldupdate 来判断传入的属性是不是有更新,其实也需要对 option 等很多的属性进行deep equal 比较,应该也是比较消耗的。
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额,sorry,我不是想让你加判断。因为其实大家用这个一般也会在外面包一层,然后添加自己的业务逻辑。大家可以自己处理shouldUpdata.
我想知道怎么能不让echart在数据明明没有变化的时候不render canvas。
就是option没变化,echart还是做了canvas的重绘,这个其实是比较重的一个操作,从chrome的性能分析工具上来看。
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那估计得 echarts 来解决了。这个估计有点难了。
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