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docs(function): edit tail call

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ruanyf 2019-08-19 12:43:12 +08:00
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docs/function.md
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@ -1047,6 +1047,8 @@ function addOne(a){
上面的函数不会进行尾调用优化，因为内层函数`inner`用到了外层函数`addOne`的内部变量`one`。
注意，目前只有 Safari 浏览器支持尾调用优化，Chrome 和 Firefox 都不支持。
### 尾递归
函数调用自身，称为递归。如果尾调用自身，就称为尾递归。