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       
(Showing Draft Content)

性能优化方法汇总

问题:性能优化方法汇总


背景:

1、在许多用户的实际应用场景中,常常需要加载几种表单:1)数据量大;2)公式多且复杂。在这些常见的场景中往往需要较多的时间去加载表单,导致每次都需要等待较长的时间,用户体验较差。

2、需要做大量的绘制操作时,表单出现“假死”的情况

3、较大数据量的表单下,需要将全部单元格进行自适应

优化方案:

场景1的优化:

1、对于表单的性能表现,我们也在不断地优化,每个版本我们也会针对一些典型的用户场景进行优化,所以新版本会相对于前面的版本性能会有所提升。例如,同一份表单在v11和v14的加载速度也会有所不同。因此,当我们使用的版本相对较旧时,最直接的方案就是升级产品版本。

2、无论是导入Excel还是导入json,其本质都是调用fromJSON将表单反序列化。在默认情况下,为保证数据完整和正确,SpreadJS会自动重算所有公式。因此我们可以通过下面几个属性来优化记载性能。

1)在fromJSON的时候,设置doNotRecalculateAfterLoad以及incrementalLoading这两属性,前者可以告知SpreadJS,不需要在导入后执行重算。开启了这个属性也不用担心,因为正常情况下,无论是Excel还是SpreadJS,公式计算默认都是实时生效的,因此在导入文档时文档数据已经是统一并正确的。后者是v14新增的属性,名为增量加载,通过改属性将在后台加载值和公式时快速显示数据,减少用户的首屏等待时间。可以参考学习指南。

https://demo.grapecity.com.cn/spreadjs/SpreadJSTutorial/features/workbook/incremental-loading/purejs

参考下面的代码为:

spread.fromJSON(workbookObj, {
  doNotRecalculateAfterLoad: true,
  incrementalLoading: true,
});

由于前端性能的限制,在一些比较极端的情况下(百万级别甚至千万级别的公式样式),即使用Excel打开都需要花费大量的时间,那么我们只关心最后展示的数据,可以用下面的属性将样式和公式忽略掉。

spread.fromJSON(workbookObj, {
  ignoreFormula: true,
  ignoreStyle: true,
});

2)Workbook的calcOnDemand配置:

使用如这句代码所示spread.options.calcOnDemand = true;

设置这个属性后告诉计算引擎,按需求执行计算,而不是每次有数据改变都重算所有的公式,同时可以配合上面的option一起使用。


场景2的优化:

对于需要一次大量绘制的情况,可以使用suspendPaint / resumePaint函数来加速渲染性能。

https://demo.grapecity.com.cn/spreadjs/SpreadJSTutorial/features/workbook/painting/purejs


场景3的优化:

在这种场景下,与绘制不一样的是,AutoFitRow应该考虑所有可见和不可见的单元格,然后获取getText(getValue+format),考虑SPAN,考虑高优先级选项,以及很多复杂的逻辑,在目前没有太大的空间来提升。

在这种情况下,一次自适应大量的单元格,这确实需要花费较多的时间。根据数据集的大小,越大的数据集也会花费更多的时间。

但是,如果只是需要显示的时候自适应可以使用附件的workaround。

作者: GrapeCity China | 审核:Lynn.Dou | 更新时间:2023.12.10