理解promise及适用场景

异步的概念:javascript 参考:http://mp.weixin.qq.com/s?__biz=MjM5MTA1MjAxMQ==&mid=2651222422&idx=1&sn=8c059af21a4cd7c9041ab719459451d5&html mpshare=1&scene=23&srcid=0511fvGzKWdEjPUi9hxyAHIn#rdjava http://www.r
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