es6 JavaScript promise 的相关内容

文章 2024-09-24 来自：开发者社区

ES6新标准下JS异步编程Promise解读

ES5及以下，要实现复杂的异步编程，需要大量运用回调函数，每一个回调函数(JS引擎把它当作一个代码块)依次进入单线程(JS)任务队伍依次执行，而每个回调函数中的执行正确与否无法及时判断，当中信息反馈及显示都只会在最外层函数执行完毕后才反馈给你，让你只能猜测或分析找问题，这将造成大量无法理解的情况出现...

文章 2022-09-29 来自：开发者社区

PromisePromise是ES6引入的异步编程的新解决方案。语法上Promise是一个构造函数，用来封装异步操作并可以获取其成功或失败的结果。Promise特点：Promsie对象异步操作有三种状态，pending(进行中)、fulfilled(已成功)和reject(已失败)。只有异步操作才可以决定当前是哪种状态；Promise状态改变有两种可能，从pending变为fulfidded和从....

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更新时间 2024-09-25 12:49:26

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