Update README.md

Doc/README.md

@@ -6,6 +6,8 @@ ___
 
 本项目是将百度的ECharts(echarts2)工具封装成对应的iOS和Mac的控件，并且将其中javascript的属性封装成对应的对象。并且提供了链式编程，方面大家进行配置Echarts的属性。方便程序员在编写程序的过程中更加关注OC的代码，避免在使用百度的ECharts工具的过程中过多的关注javascript语法和与javascript之间的交互。
 
+> 注意: 如果你App最低支持到iOS8.0, 我建议您使用 `WKEchartsView`, 因为 `WKEchartsView` 是基于 `WKWebView` 的。 而 `WKEchartsView` 的接口与 `PYEchartsView` 的接口是一样的，所以如果你想从之前的替换到 `WKEchartsView`， 只需将 `PYEchartsView` 替换成`WKEchartsView` 即可。
+
 注：如果小伙伴觉得这个工具有用的话，麻烦点一下star，你的star是我继续的动力！
 
 如果你遇到什么问题可以添加一个[Issue](https://github.com/Pluto-Y/iOS-Echarts/issues/new)给我。当然同时欢迎大家给我一个Pull Request。

README.md

@@ -5,7 +5,9 @@
 
 ____
 
-This is a highly custom chart control for iOS and Mac apps, which build with the EChart(Echart2). It just encapsulate the conrol of the javascript. It provides a chainable way of describing your configurations for the echarts.  It's convinient for foucing on the logic of the app and optimizing the code. It avoid diverting developers' mind on the interaction between javascript and Objective-C.
+This is a highly custom chart control for iOS and Mac apps, which build with the Echart(Echart2). It just encapsulate the conrol of the javascript. It provides a chainable way of describing your configurations for the echarts.  It's convinient for foucing on the logic of the app and optimizing the code. It avoid diverting developers' mind on the interaction between javascript and Objective-C.
+
+> Tips: If you want to use even iOS8.0, I suggest you use `WKEchartsView` which is based on `WKWebView`. The interface of `WKEchartsView` is same as `PYEchartsView`, so if you are using `PYEchartsView`, you just change `PYEchartsView` into `WKEchartsView`.
 
 If you like this control, please star it. It can make me pay more attention on it.