rule 1
- Sequences can have 0 or more elements.
- Once an error or completed event is received, the sequence cannot produce any other element.
- When a sequence sends the completed or error event all internal resources that compute sequence elements will be freed.
- To cancel production of sequence elements and free resources immediately, call dispose on the returned subscription.
rule 2
- onNext 没结束之前，onComplete、onError、onNext都不会开始执行
- dispose被释放之后，其相关的订阅都会执行dispose
- Observerable，subscribe是同步的
- 可被订阅者，被订阅者，可被订阅，之后发布消息
- 订阅者，订阅者发布消息
other
现在只是用熟练了绑定，监听。