When writing native js, the spell check works, but the car error does not work

[weiqiyue]

like this.

[usernamehw]

I don't understand what you're asking.

[weiqiyue]

I don't understand what you're asking. Error checking doesn't work. It's an undefined variable, and logically speaking, an error should be reported, right?

[usernamehw]

It's very likely not a problem with extension. If it had a squiggly underline (error) and Error Lens didn't highlight it - that would be a problem with extension.

JavaScript probably doesn't report errors like this. It would be caught if it used TypeScript error checking:

// @ts-check
shuju++;
console.log(shuju);