zyx4843的专栏

一、安装Homebrewhttp://brew.sh ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"可能用到的brew命令brew listen 列出已安装的软件brew update 更新brewbrew home 用浏览器打开brew的官方网站

安装Node.js的canvas库时发现canvas依赖cairo包：$ npm install canvas...> node-gyp rebuild...No package 'cairo' found可以通过brew安装，但是安装时发现cairo依赖于X11：$ brew install cairocairo: Unsatisfied dependency:

process.nextTick()和setImmediate()在node.js中都是将回调函数延时执行。跟setTimeout(function(){}, 0);类似，但性能不一样，setTimeout定时器是采用红黑树，process.nextTick()是用数组，setImmediate()是用链表。先看看process.nextTick()的代码process.nextTick(