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性能优化方案

问题：SpreadJS性能优化方案

背景：

在使用SpreadJS时，遇到大量公式、数据设置时，会出现渲染过慢的问题，本文会详细介绍在使用SpreadJS中场景的一些优化方式。

优化方案：

SpreadJS中可以通过挂起计算、绘制、事件监听等方式提升使用性能，我们可以先通过下边的示例代码做初步了解。

我们可以根据截图中的代码及注释，结合产品API文档全面了解方法的含义。根据需要操作的内容，暂停相关的行为。

其中在暂停和恢复计算，即suspendCalcService()和resumeCalcService()时，查阅API文档，会发现有一个Boolean类型的参数，很多人对于这个参数的设置会存在疑问，不知道是否应该配套使用，来达到最好的性能。接下来主要对这两个API的参数做相关解释。

1. suspendCalcService()方法接收的参数是ignoreDirty，即是否和略脏数据，关于脏数据，可以点击学习指南相关模块了解。整体来说，传true性能好，但是会有一定的风险，推荐传递false。

2. resumeCalcService()方法接收的参数为recalcAll，即是否重新计算全部数据，传递false表示只计算挂起计算之后添加或修改的公式，也就是只运算执行suspendCalcService之后发生变化的公式，否则，计算全部公式。

两者不存在配套使用的关系，如果在暂停计算时，忽略了脏数据，那推荐计算时做全部计算。其余情况，我们自行去设置对应参数即可。

作者: Winny.Zhang | 审核：Lynn.Dou | 更新时间：2023.12.10