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Merge pull request #84 from icecreamliker/patch-3

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update let.md
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Ruan YiFeng 2015-09-21 11:26:24 +08:00
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@ -208,7 +208,7 @@ function f(){
f() // undefined f() // undefined
``` ```
上面代码中，函数f执行后没有任何输出，原因在于变量提升，导致内层的tmp变量覆盖了外层的tmp变量。 上面代码中，函数f执行后，输出结果为`undefined`，原因在于变量提升，导致内层的tmp变量覆盖了外层的tmp变量。
第二种场景，用来计数的循环变量泄露为全局变量。 第二种场景，用来计数的循环变量泄露为全局变量。