Web FnMut的问题

我正在努力学习生锈的WASM，我正在使用web_sys库

我正在处理的页面有一个带有id、player\u name\u按钮的输入，还有一个带有player\u name\u按钮的按钮。在本教程之后，当我尝试在按钮单击上放置行为时，我遇到了一个编译器错误：

| 84 |让a=Closure:：wrapBox:：newmove |{ | ___________________________________^ 85 | | name_input_value=value&mut Someplayer_name_input； 86 | |如果名称_输入_值==字符串：：新建{ 87 | | |提醒你注意我的名字！； ... | 93 | | } 94 | |}as框； ||uuuuuuuuuuuuuuuuuuu^应为'FnMut'闭包，找到`[closure@src\lib.rs:84:44:94:14播放器\u名称\u输入：web\u系统：：功能：：gen\u元素：：元素，名称\u输入\u值：std：：字符串：：字符串，播放器\u存储：播放器：：播放器：：播放器运动]` 代码如下：

let player_name_input = document
    .get_element_by_id("player_name_input")
    .expect("should have #num-clicks on the page");

let mut name_input_value = String::new();
//

let a = Closure::wrap(Box::new(move || {
    name_input_value = value(&mut Some(player_name_input));
    if name_input_value == String::new() {
        alert("Please informe the name!");
    } else {
        let mut p = Player {
            name: name_input_value,
        };
        player_storage.insert(p);
    }
}) as Box<dyn FnMut()>);
document
    .get_element_by_id("player_name_button")
    .expect("should have #player_name_button on the page")
    .dyn_ref::<HtmlElement>()
    .expect("#player_name_button be an `HtmlElement`")
    .set_onclick(Some(a.as_ref().unchecked_ref()));

// See comments in `setup_clock` above for why we use `a.forget()`.
a.forget();

---

这是由两种可能的原因之一造成的。我不知道是哪一个，但它们在这里：

关闭后使用player_name_input或name_input_value变量。 player_name_输入变量包含对文档的引用。

---

这两个问题都会导致闭包不是“静态的”，即它将包含对存储在自身外部的值的引用。这是一个问题，因为Box隐式地有一个BoxI，我猜你的闭包不是“静态的”，也就是说它保存了对stack player_存储或player_name_输入中的值的引用，这是不允许的。这会通过使用clone来解决吗？很难回答你的问题，因为它不包含。我们无法说出代码中存在哪些板条箱及其版本、类型、特征、字段等。如果您试图重现您的错误（如果可能的话），或者在全新的货运项目中，那么我们将更容易帮助您，然后您的问题将包括附加信息。您可以使用以下方法减少在此处发布的原始代码。谢谢

[lib]
crate-type = ["cdylib", "rlib"]

[build-dependencies]
askama = "0.7.2"

[dependencies]
wasm-bindgen = "0.2.60"
js-sys = "0.3.37"
askama = "0.7.2"
console_error_panic_hook = "0.1.5"

[dependencies.web-sys]
version = "0.3.5"
features = [
  'console',
  'CssStyleDeclaration',
  'Document',
  'DomStringMap',
  'DomTokenList',
  'Element',
  'Event',
  'EventTarget',
  'HtmlBodyElement',
  'HtmlElement',
  'HtmlInputElement',
  'KeyboardEvent',
  'Location',
  'Node',
  'NodeList',
  'Storage',
  'Window',
]

# The `console_error_panic_hook` crate provides better debugging of panics by
# logging them with `console.error`. This is great for development, but requires
# all the `std::fmt` and `std::panicking` infrastructure, so isn't great for
# code size when deploying.
console_error_panic_hook = { version = "0.1.1", optional = true }

# `wee_alloc` is a tiny allocator for wasm that is only ~1K in code size
# compared to the default allocator's ~10K. It is slower than the default
# allocator, however.
#
# Unfortunately, `wee_alloc` requires nightly Rust when targeting wasm for now.
wee_alloc = { version = "0.4.2", optional = true }

[dev-dependencies]
wasm-bindgen-test = "0.2"

[profile.release]
# Tell `rustc` to optimize for small code size.
opt-level = "s"