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then前面返回一个promise #3

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kg-web opened this issue May 11, 2017 · 0 comments

kg-web commented May 11, 2017 •

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如果前面返回的是Promise对象，后面的then将会被当做这个返回的Promise的第一个then来对待

大师，这句话能不能在解释下，没有太明白。
还有，你后面又讲到，then必须返回promise，这样then才能链式使用

有些糊涂了

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