未捕获的TypeError：undefined不是一个承诺

Question

I got error of Uncaught TypeError: undefined is not a promise

const p = Promise((resolve, reject) => {
  resolve('ok')
})

p.then(resp => console.log(resp))

https://jsbin.com/daluquxira/edit?js,console,output

what's wrong with above code?

Answer 1

You need to instantiate the Promise .

In this case:

 const p = new Promise((resolve, reject) => { resolve('ok') }) p.then(resp => console.log(resp))