使用Rust和wasm-bindgen创建一个闭包来创建另一个带有state的闭包可以通过以下步骤实现:
[package]
name = "your_project_name"
version = "0.1.0"
edition = "2018"
[lib]
crate-type = ["cdylib"]
[dependencies]
wasm-bindgen = "0.2"
use wasm_bindgen::prelude::*;
#[wasm_bindgen]
extern "C" {
#[wasm_bindgen(js_namespace = console)]
fn log(s: &str);
}
#[wasm_bindgen]
pub struct ClosureWithState {
state: i32,
}
#[wasm_bindgen]
impl ClosureWithState {
#[wasm_bindgen(constructor)]
pub fn new() -> Self {
Self { state: 0 }
}
#[wasm_bindgen]
pub fn create_closure(&mut self) -> Closure<dyn FnMut()> {
let state = self.state;
let closure = Closure::wrap(Box::new(move || {
log(&format!("State: {}", state));
}) as Box<dyn FnMut()>);
closure
}
}
cargo build --target wasm32-unknown-unknown --release
wasm-bindgen target/wasm32-unknown-unknown/release/your_project_name.wasm --out-dir .
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8" />
<title>Rust WebAssembly</title>
<script src="your_project_name.js"></script>
<script>
const closureWithState = new wasm_bindgen.ClosureWithState();
const closure = closureWithState.create_closure();
closure();
closureWithState.free();
</script>
</head>
<body></body>
</html>
这样,你就可以使用Rust和wasm-bindgen创建一个闭包来创建另一个带有state的闭包了。在上述示例中,我们创建了一个名为ClosureWithState
的Rust结构体,其中包含一个带有state的闭包。通过调用create_closure
方法,我们可以创建一个闭包,并在闭包中访问结构体的state。最后,我们在JavaScript中调用闭包并打印state。
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