bluebird-harness:重试，退避，超时库以实现承诺

bluebird-harness.js 重试，退避，超时库以利用承诺。 与node.js和浏览器环境兼容。 var Promise = require ( 'bluebird' ) , harness = require ( 'bluebird-harness' ) , harness ( { // make at most 3 attempts attempt : 3 , // with a 1s interval between fails interval : 1000 , // increasing interval by 1s per successive attempt backoff : 1000 , // timeout wrapped method if executes longer than 1s timeout : 1000