const list = [1,2,100,50,100,20]
const index = list.findLastIndex((item)=>item===100)
console.log(index)
// TypeError: list.findLastIndex is not a function

Can we say that this method does not exist, but it does exist in MDN

CodePudding user response：

if you look at compatibility info on MDN

it is not supported below node 18.

check your node version

    node -v

Or

    node --version