Today I found a google chrome an optimized strategy that make it could to show the closure variable when debugging. More details below:

• Why does Chrome debugger get undefined when accessing variables in Closure?

• React 'this' is undefined in Chrome developer tools

• https://medium.com/@justintulk/why-are-my-variables-undefined-when-using-debugger-in-chrome-devtools-9f5cb86e145a

But it is not convenient when using google chrome to debugging, is it possible to make it show the closure variable?