Documentation improvement: clarify function assignment behavior

还没有人认领这个 Issue。

I was reading the Function expressions section and noticed a wording choice that confused me a little.

The section mentions that we can "copy a function to another variable". Maybe the intention is to show that functions are values in JavaScript, the wording initially made me think that a new function was being created.

**issue in the section -> url -> https://javascript.info/function-expressions
topic is "Function is a Value"**

the example code was ->
function sayHi() { // (1) create
alert( "Hello" );
}

let func = sayHi; // (2) copy

func(); // Hello // (3) run the copy (it works)!
sayHi(); // Hello // this still works too (why wouldn't it)

My understanding is that func receives a reference to the same function object rather than creating an independent copy of the function itself.
There maybe a chance that i have misunderstood it , the copy could mean the reference is copied and a little context about reference would help even if it is included in the previous section.

This is not a major issue, but I thought a small clarification might help readers who are learning about values and references.

Thank you so much for the documentation

打开 https://javascript.info/function-expressions 中的 Function expressions 部分，找到“Function is a Value”主题及其赋值示例。检查“copy a function”周围的措辞，并明确说明赋值的是对同一个函数对象的引用，同时保持示例的行为不变。当解释对学习者来说清晰明确且示例仍然正确时，即视为完成。

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