关于javascript:Promise回调地狱thenfulfiledreject

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：

代码自身就不“好”看，眼睛都花了……(ﾒ`ﾛ´)/
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？
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 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：

代码执行程序
console.log(value) 中 value 的值由 resolve()传递
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：

这样，代码的可读性是不是变得更强了？

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_）

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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