基础Promise类方法resolve()

resolve()可直接返回Promise成功对象

把一个普通对象转为Promise对象

手动实现Promise对象

// 转成Promise对象
function foo() {
const obj = { name: "why" }
return new Promise((resolve) => {
resolve(obj)
})
}

foo().then(res => {
console.log("res:", res) //res: { name: 'why' }
})
resolve()实现

// 类方法Promise.resolve
// 普通的值
const promise = Promise.resolve({ name: "swh" })
// 相当于
// const promise2 = new Promise((resolve, reject) => {
// resolve({ name: "swh" })
// })

promise.then(res => {
console.log("res:", res) //res: { name: 'why' }
})
传入Promise

// 传入Promise
const promise = Promise.resolve(new Promise((resolve, reject) => {
resolve("11111")
}))
promise.then(res => {
console.log("res:", res) //res: 11111
})
传入thenable对象

// 传入thenable对象
const promise = Promise.resolve({
then: function(resolve, reject) {
resolve(222222)
}
})
promise.then(res => {
console.log("res:", res) //res: 222222
})
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原文链接：https://blog.csdn.net/weixin_42681555/article/details/121976711