【JS】Promise：回调地狱/then()/fulfiled/reject

Z时代
2024-01-10
分类：技术分享

回调地狱

在JavaScript中，异步通常就伴随着回调_（复习：异步和回调__）_。

为什么呢？看下面的代码：

let result = false; function loadSuccess() { setTimeout(function () { result = true; }, 1000) } loadSuccess(); console.log(result ? 'oh yeah!' : 'what happen?');

@想一想@：结果是什么？_（__演示：并__在控制台看一下result的值__）_

如果我们想要保持loadSuccess的封装，并在result的值在loadSuccess()中被改变后再影响console.log()，大概只能把上述代码改成这个样子：

function loadSuccess(callback) { setTimeout(function () { //如果这个result也依赖于另一个异步函数，咋整？ var result = true; console.log(result ? 'oh yeah!' : 'what happen?'); }, 1000) }

但是，假设_（事实上很容易出现这种情况，尤其是node.js中）_loadSucess()里的result也依赖于另一个异步函数，咋整？

@想一想@：能不能由某个异步方法返回bool值

var result = someAsyncFunc();

实际上最终只能写成这个样子

function loadAnotherSuccess(callback) { setTimeout(function () { //获得result值的异步方法 var result = true; setTimeout(function () { console.log(result ? 'oh yeah!' : 'what happen?'); }, 1000) }, 1000) }

@想一想@：能不能在loadAnotherSuccess()中直接调用之前的loadSuccess()？_（复习：文本作用域和闭包）_

setTimeout(function () { loadSuccess(result); //需要改造loadSuccess() }, 1000)

@想一想@：再进一步，如果loadAnotherSuccess()还需要另外一个异步函数的结果……

这就是大名鼎鼎的回调地狱（callback hell）：

【JS】Promise：回调地狱/then()/fulfiled/reject

之所以称其为地狱，是因为：

代码本身就不“好”看，眼睛都花了……(ﾒ｀ﾛ´)/

书写/维护代码时，其内容和“正常”的流程是反的。比如：我需要一个result的值，
正常的做法是：调用能获得result值的函数即可；
但这里是要：把我当前的代码放到能获得result值的函数里面去？

无法捕捉异常，因为在不同的“栈”（演示：略）

所以，我们迫切的需要引入：

Promise

promise是ES6推出的新的内置类。使用它的大致方式是：

let p = new Promise(function (resolve, reject) { resolve('resolve'); }); p.then(function (value) { console.log(value); }); console.log('after then');

注意：

Promise的构造函数参数resolve和reject，都是函数
@想一想@：这两个参数是不是必须名为resolve和reject？

resolve和reject本身又是两个内置函数，都可以带一个参数

断点演示：

代码执行顺序

console.log(value) 中value的值由resolve()传递

注释掉：resolve('resolve');

我们得到的规律是：then()一定会在resolve()之后才能执行；没有执行resolve()，就不会执行then()，但这有什么作用呢？

用Promise重写之前地狱回调代码：

这样，代码的可读性是不是变得更强了？

内部原理

每一个Promise实例中都保存着一个状态（status）。状态值有三种：

pending（进行中）：默认初始状态

fulfiled（成功）：调用resolve(value)后获得，即resolve()将Promise实例的状态由pending转换为fulfiled

rejected（失败）：调用reject(error)后获得：即reject()将Promise实例的状态由pending转换为rejected

注意：这三种状态在Promise实例外部无法改变，只能在Promise的构造函数中的代码实现。

方法then()总是会在Promise实例化之后，检查其状态：

如果是pending，不予任何执行

如果是fulfiled，执行其第一个回调函数

如果是rejected，执行其第二个回调函数

是异步操作出现错误

，通常是异步操作成功运行

状态

和某个未来才会结束的事件（通常是一个异步操作）的结果。

（设断点演示：状态转变，略）

then，catch和finally

promise对象可以通过调用：

then()：两个callback function参数，第一个是resolved之后的调用，第二个（可选）是reject之后的调用

catch()：等同于.then(null, rejection)或.then(undefined, rejection)：推荐catch写法。
注意：不显示catch，error就会被“吞”掉：console中仍然会报错，但不阻断后续（如setTimeout()）代码的执行

finally()：有错没错，最后都要执行的。
let p = new Promise(function (resolve, reject) { setTimeout(function () { var result = true; if (true) { throw new Error('......'); resolve(result); } else { reject('error'); } console.log('after error'); }, 1000); }); p.then(function (result) { console.log(result ? 'oh yeah!' : 'what happen?'); }).catch(function (reason) { //推荐：可读性更高 console.log(reason); }).finally(function () { console.log('finally'); })

（_演示：_略_。注意：setInterval()演示promise的状态一旦确定，无法再更改_）

then()的连缀

因为then()还会返回一个新的Promise实例，所以then()后面还可以紧接着继续调用then()……_（复习：JQuery的链式调用）_

需要return

new Promise((resolve, reject) => { setTimeout(function() { console.log('第 1 次resolve'); resolve(false); }, 500) }).then(function(result) { return new Promise((resolve, reject) => { setTimeout(function() { console.log('第 2 次resolve'); resolve(result); }, 500) }); }).then(function(result) { if (result) { console.log('oh yeah!'); } else { console.log('what happen?') }https://github.com/hdfgfgh546...
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