var p3 = new Promise((resolve, reject) => {
resolve('B')
})
var p1 = new Promise((resolve, reject) => {
resolve(p3)
})
p2 = new Promise((resolve, reject) => {
resolve("A")
})
p1.then(v => console.log(v))
p2.then(v => console.log(v))
chrome console
vs code 终端：
