Boa 的 boa_runtime Crate 包含一个示例运行时以及为运行时实现者提供的 boa_engine Crate 的基本运行时功能和功能。

示例：添加 Web API 的 Console 对象

1. 将 boa_runtime 和 boa_engine 一起作为依赖项添加到您的项目中。

use boa_engine::{js_string, property::Attribute, Context, Source};
use boa_runtime::Console;

// Create the context.
let mut context = Context::default();

// Initialize the Console object.
let console = Console::init(&mut context);

// Register the console as a global property to the context.
context
    .register_global_property(js_string!(Console::NAME), console, Attribute::all())
    .expect("the console object shouldn't exist yet");

// JavaScript source for parsing.
let js_code = "console.log('Hello World from a JS code string!')";

// Parse the source code
match context.eval(Source::from_bytes(js_code)) {
    Ok(res) => {
        println!(
            "{}",
            res.to_string(&mut context).unwrap().to_std_string_escaped()
        );
    }
    Err(e) => {
        // Pretty print the error
        eprintln!("Uncaught {e}");
        # panic!("An error occured in boa_runtime's js_code");
    }
};