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Eventloop不可怕，可怕的是遇上Promise
source link: https://juejin.im/post/5c9a43175188252d876e5903
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有关Eventloop+Promise的面试题大约分以下几个版本——得心应手版、游刃有余版、炉火纯青版、登峰造极版和究极变态版。假设小伙伴们战到最后一题，以后遇到此类问题，都是所向披靡。当然如果面试官们还能想出更变态的版本，算我输。 版本一：得心应手版 考点
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