未捕获的TypeError：undefined不是一个承诺

Question

我收到了Uncaught TypeError: undefined is not a promise

的错误

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

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

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

上述代码有什么问题？

Answer 1

您需要实例化Promise。

在这种情况下：

＆＃13;

＆＃13;

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

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

＆＃13;

＆＃13;

＆＃13;