Advanced working with function: Function in if

還沒有人認領這個 Issue。

**Function in if**

let phrase = "Hello";

if (true) {
let user = "John";

function sayHi() {
alert(`${phrase}, ${user}`);
}
}

sayHi();

**As mentioned, in the solution:**
The result is an error.
The function sayHi is declared inside the if, so it only lives inside it. There is no sayHi outside.

But, this is wrong.
once the function is called, it will give us "Hello John" and the explanation is quite simple.
There, won't be any error.

檢視「Function in if」範例以及 issue 中引用的解決方案說明。在 JavaScript 執行環境中驗證所描述的行為，然後更新教學文字，使說明與觀察到的結果一致，並清楚說明函式的作用域。

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