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next / express / next-routes
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when catch promise error, retry
执行promise 函数，如碰到错误，进行重试。then 和catch 返回的参数保持与原函数fn 一致。
npm install retry-if-err --saveconst retryIfErr = require('retry-if-err')
retryIfErr(fn, tryCount, tryInterval, ...params).then().catch()