关于 phoneGap 如何做 二维码扫描
1. 先配置好, 环境
http://coenraets.org/blog/cordova-phonegap-3-tutorial/
http://ccoenraets.github.io/cordova-tutorial/
http://ccoenraets.github.io/cordova-tutorial/create-cordova-project.html
2. 安装 扫描插件
https://github.com/ccoenraets/cordova-tutorial
http://blog.csdn.net/xiaoguang44/article/details/7768099
http://stackoverflow.com/questions/10897081/retrieving-last-known-geolocation-phonegap
cordova plugins add com.phonegap.plugins.barcodescanner
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