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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