nicolo-ribaudo

This for loop:

for (let i = 0, getI = () => i; i < 3; i++)
  console.log(getI());

unrolls to:

lovetingyuan

function resolveValue (promise, value, resolve, reject) {
  if (promise === value) { // 不能resolve自身
    return reject(new TypeError('Can not resolve or return the current promise.'))
  }
  if (value === null || (typeof value !== 'object' && typeof value !== 'function')) {
    return resolve(value)
  }
  let then // thenable可能是对象或者函数，它的then只能读取一次并且需要捕获可能的错误
  try {
    then = value.then