关于javascript:Promise回调地狱thenfulfiledreject

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回调天堂

在 JavaScript 中，异步通常就随同着回调_（温习：异步和回调__）_。

为什么呢？看上面的代码：

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

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

如果咱们想要放弃 loadSuccess 的封装，并在 result 的值在 loadSuccess()中被扭转后再影响 console.log()，大略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) }

然而，假如_（事实上很容易呈现这种状况，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 @：能不能由某个异步办法返回 bool 值

var result = someAsyncFunc();

实际上最终只能写成这个样子

function loadAnotherSuccess(callback) {setTimeout(function () {// 取得 result 值的异步办法 var result = true; setTimeout(function () {console.log(result ? ‘oh yeah!’ : ‘what happen?’); }, 1000) }, 1000) }

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

setTimeout(function () {loadSuccess(result); // 须要革新 loadSuccess()}, 1000)

@想一想 @：再进一步，如果 loadAnotherSuccess()还须要另外一个异步函数的后果……

这就是赫赫有名的 回调天堂（callback hell）：

之所以称其为天堂，是因为：

  1. 代码自身就不“好”看，眼睛都花了……(ﾒ`ﾛ´)/
  2. 书写 / 保护代码时，其内容和“失常”的流程是反的。比方：我须要一个 result 的值，
    失常的做法是：调用能取得 result 值的函数即可；
    但这里是要：把我以后的代码放到能取得 result 值的函数外面去？
  3. 无奈捕获异样，因为在不同的“栈”（演示：略）

所以，咱们迫切的须要引入：

Promise

promise 是 ES6 推出的新的内置类。应用它的大抵形式是：

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

留神：

  • Promise 的结构函数参数 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 自身又是两个内置函数，都能够带一个参数

断点演示：

  1. 代码执行程序
  2. console.log(value) 中 value 的值由 resolve()传递
  3. 正文掉：resolve(‘resolve’);

咱们失去的法则是：then()肯定会在 resolve()之后能力执行；没有执行 resolve()，就不会执行 then()，但这有什么作用呢？

用 Promise 重写之前天堂回调代码：

let p = new Promise(function (resolve, reject) {setTimeout(function () {var result = true; resolve(result); // 先取得 result 的值 }, 1000); }); p.then(function (result) {console.log(result ? ‘oh yeah!’ : ‘what happen?’); // 肯定会在失去 result 的值后才运行 })

这样，代码的可读性是不是变得更强了？

外部原理

每一个 Promise 实例中都保留着一个状态（status）。状态值有三种：

  • pending（进行中）：默认初始状态
  • fulfiled（胜利）：调用 resolve(value)后取得，即 resolve()将 Promise 实例的状态由 pending 转换为 fulfiled
  • rejected（失败）：调用 reject(error)后取得：即 reject()将 Promise 实例的状态由 pending 转换为 rejected

留神：这三种状态在 Promise 实例内部无奈扭转，只能在 Promise 的构造函数中的代码实现。

办法 then()总是会在 Promise 实例化之后，查看其状态：

  • 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

是异步操作呈现谬误

，通常是异步操作胜利运行

状态

和某个将来才会完结的事件（通常是一个异步操作）的后果。

（设断点演示：状态转变，略）

then，catch 和 finally

promise 对象能够通过调用：

  • 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)：举荐 catch 写法。
    留神：不显示 catch，error 就会被“吞”掉：console 中依然会报错，但不阻断后续（如 setTimeout()）代码的执行
  • finally()：有错没错，最初都要执行的。

    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) {// 举荐：可读性更高 console.log(reason); }).finally(function () {console.log(‘finally’); })

（_演示：_略_。留神：setInterval()演示 promise 的状态一旦确定，无奈再更改_）

then()的连缀

因为 then()还会返回一个 新的 Promise 实例，所以 then() 前面还能够紧接着持续调用 then()……_（温习：JQuery 的链式调用）_

须要 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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javascript
发表至： javascript
2020-12-27
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