Update async.md #226
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Update async.md #226
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横向 纵向的比喻的感觉不太自然， 还不如直接点。
| 不难想象，如果依次读取多个文件，就会出现多重嵌套。代码不是纵向发展，而是横向发展，很快就会乱成一团，无法管理。这种情况就称为"回调函数噩梦"（callback hell）。 | ||
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| Promise就是为了解决这个问题而提出的。它不是新的语法功能，而是一种新的写法，允许将回调函数的横向加载，改成纵向加载。采用Promise，连续读取多个文件，写法如下。 | ||
| Promise就是为了解决这个问题而提出的。它不是新的语法功能，而是一种新的写法，允许将回调函数的嵌套，改成链式。采用Promise，连续读取多个文件，写法如下。 |
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横向 纵向的比喻的感觉不太自然， 还不如直接点。