enable updating the config of a plot without changing other parameters

We can change the layout of an existing plot with Plotly.relayout, change the data with Plotly.react, but how to change the config of a plot without changing the other parameters?

Example:

// happens when clicking on a button
var config = element.config;    // problem: this doesn't exist!   <-- how to get the current config state of the plot?
config["staticPlot"] = true;  // let's add a configuration parameter
Plotly.react(element.id, element.data, element.layout, config)

How to get element.config in the same way element.layout and element.data exist?

首先阅读 issue 中引用的入口 Plotly.relayout 和 Plotly.react，然后跟踪现有 plot 如何暴露其数据、layout 和配置状态。当能够获取并更新 plot 的当前 config，同时不改变其其他参数，且相关测试覆盖了该行为时，工作就完成了。