staltz

The introduction to Reactive Programming you've been missing

(by @andrestaltz)

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This tutorial as a series of videos

If you prefer to watch video tutorials with live-coding, then check out this series I recorded with the same contents as in this article: Egghead.io - Introduction to Reactive Programming.

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johnpolacek

[alias]
	co = checkout
	cob = checkout -b
	coo = !git fetch && git checkout
	br = branch
	brd = branch -d
	brD = branch -D
	merged = branch --merged
	st = status
	aa = add -A .

gaearon

// connect() is a function that injects Redux-related props into your component.
// You can inject data and callbacks that change that data by dispatching actions.
function connect(mapStateToProps, mapDispatchToProps) {
  // It lets us inject component as the last step so people can use it as a decorator.
  // Generally you don't need to worry about it.
  return function (WrappedComponent) {
    // It returns a component
    return class extends React.Component {
      render() {
        return (

中国地图偏移算法.md

中国地图偏移算法

WGS-84 坐标系，是 GPS 系统所采用的坐标系。一切正常工作的 GPS 或 GPS 芯片所返回的坐标值都是这个坐标系下的数值。Google 地图采用的卫星图也是按照这个坐标系摆放的。

GCJ-02 坐标系，是我天朝政府搞出来的加密坐标系，也常常被称为“火星坐标系”。包括（但可能不限于）高德地图在内的国内地图服务商采用它来绘制地图。Apple、Google等国外公司在其道路地图中使用的也是高德的数据。BD-09 坐标系则是百度地图专用的坐标系。

在开发一些 LBS 应用时，如果不加处理，很容易出现几种形式的地图之间出现偏移的情况。因此在这几个坐标系之间进行转换非常重要。以下代码就是网络上泄露出的从 WGS-84 转 GCJ-02 的算法，以及 GCJ-02 与 BD-09 的互相转换算法。