use a function javascript in rust

To use a JavaScript function inside a Rust application, you need to use WebAssembly (WASM). Rust has strong support for generating WebAssembly, and you can use it to call JavaScript functions using Web APIs.

Here's an example using the web-sys and js-sys crates in Rust:

main.rs
use wasm_bindgen::prelude::*;
use web_sys::{console};
use js_sys::Function;

#[wasm_bindgen(start)]
pub fn run() -> Result<(), JsValue> {
    let js_function = Function::new_no_args("myJsFunction");
    let js_result = js_function.call();
    console::log_1(&js_result);
    Ok(())
}
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In this example, we're calling a JavaScript function named myJsFunction, and logging the result to the console using the console::log_1 method from the web-sys crate.

Keep in mind that in order to use WebAssembly in a browser, you'll need to use a bundler like webpack to package your Rust code into a JavaScript file that can be loaded in a browser.