"Async JavaScript is the first full book I've seen dedicated to a key topic in JavaScript development today: how to deal with concurrency and concurrent tasks without going crazy! For the sake of your sanity, check this out."
—Peter Cooper, creator of JavaScript Weekly
JavaScript is a single-threaded language living in a multimedia, multi-tasking, multi-core world. Even experienced JavaScripters sometimes find themselves overwhelmed as complex apps grow into a tangled web of callbacks.
With Async JavaScript, you'll learn about:
•Event scheduling
•The PubSub pattern
•Promises and Deferred objects
•Flow control with Async.js
•Recipes for common async scenarios
•Multi-threading with Web Workers
•AltJS languages
and more, with examples tailored to jQuery and Node.js.
Trevor is a freelance web developer, author, and speaker living in Cambridge, MA. His first book, CoffeeScript: Accelerated JavaScript Development, was published by PragProg.
- "Even the ubiquitous console.log is async in some environments. In WebKit-based browsers (Chrome and Safari), this code will log {foo: bar}:"
- "(Node’s console.log, on the other hand, is synchronous, so the same code will output {}.)"
- "(setTimeout) On the face of it, it looks like each trip to the event queue is adding overhead of about 5ms in modern browsers (1ms in Node)."
- "分布式事件：事件的蝴蝶偶然扇动了下翅膀，整个应用到处都引发了反应"
- "PubSub帮助我们在MVC三层中把视图层的事件发布到模型层。"
- "每个Deferred对象都含有一个Promise对象，而每个 Promise对象都代表着一个 Deferred对象。有了 Deferred对象，就 可以控制其状态，而有了纯 Promise 对象，只能读取其状态及附加回调。"
- "when相当于Promise执行情况的逻辑与运算符（AND） * when合并对象对应的回调，建议直接绑定在原promise对象的回调上。 * then(onSuccessed, onFailed)"
