本地通知

cron 是 linux 下的一个定时执行工具。启动、关闭：

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$ service cron start
$ service cron stop
$ service cron restart

定义变量

Shell 读取输入用 read

Objects, values and types

All data in a Python program is represented by objects or by relations between objects.

Every object has an identity, a type and a value.

Cordova - Develop for platforms (Android)

tuple