meathill-lecture / promise-yes Goto Github PK
View Code? Open in Web Editor NEWSlide about how to use Promise in JavaScript.
Home Page: https://meathill-lecture.github.io/promise-yes
promise-yes's People
Contributors
Stargazers
Watchers
Forkers
dachengzi000promise-yes's Issues
【修正】Promise N种用法-异步回调的问题-findLargest 解析
问题1：
因为回调函数和启动函数不在一个栈里，所以 try/catch 无法捕获到回调函数抛出的错误。于是回调函数只能用 callback(err) 的形式将错误反馈给启动函数。
问题2：
在外层作用域声明的变量，可能被其它函数访问和修改，造成错误。所以一般来说我们推荐哪里使用哪里声明。但是由于我们不清楚这些异步操作的完成顺序，只能在外层作用域声明变量。
问题3：
只有上面两个问题，没有标称的4个问题。
Recommend Projects
-
React
A declarative, efficient, and flexible JavaScript library for building user interfaces.
-
Vue.js
🖖 Vue.js is a progressive, incrementally-adoptable JavaScript framework for building UI on the web.
-
Typescript
TypeScript is a superset of JavaScript that compiles to clean JavaScript output.
-
TensorFlow
An Open Source Machine Learning Framework for Everyone
-
Django
The Web framework for perfectionists with deadlines.
-
Laravel
A PHP framework for web artisans
-
D3
Bring data to life with SVG, Canvas and HTML. 📊📈🎉
-
Recommend Topics
-
javascript
JavaScript (JS) is a lightweight interpreted programming language with first-class functions.
-
web
Some thing interesting about web. New door for the world.
-
server
A server is a program made to process requests and deliver data to clients.
-
Machine learning
Machine learning is a way of modeling and interpreting data that allows a piece of software to respond intelligently.
-
Visualization
Some thing interesting about visualization, use data art
-
Game
Some thing interesting about game, make everyone happy.
Recommend Org
-
Facebook
We are working to build community through open source technology. NB: members must have two-factor auth.
-
Microsoft
Open source projects and samples from Microsoft.
-
Google
Google ❤️ Open Source for everyone.
-
Alibaba
Alibaba Open Source for everyone
-
D3
Data-Driven Documents codes.
-
Tencent
China tencent open source team.