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webassembly 简单例子 #9

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BUPTlhuanyu opened this issue Feb 26, 2023 · 0 comments
Open

webassembly 简单例子 #9

BUPTlhuanyu opened this issue Feb 26, 2023 · 0 comments

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@BUPTlhuanyu
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BUPTlhuanyu commented Feb 26, 2023 •
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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script>
        // 1. c++ 代码
        // int fib (int x) {
        //     if (x <= 0) {
        //         return 0;
        //     }
        //     if (x <= 2) {
        //         return 1;
        //     }
        //     return fib(x - 1) + fib(x - 2);
        // }
        // 2. 输出到 https://mbebenita.github.io/WasmExplorer/ 生成 wat 并下载
        // 3. 引入并执行
        fetch('./test.wasm').then((res) => res.arrayBuffer())
            .then((bytes) => WebAssembly.compile(bytes))
            .then((mod) => {
                const ins = new WebAssembly.Instance(mod);
                const a = ins.exports;
                console.time('lib');
                const res = a._Z3fibi(40);
                console.timeEnd('lib');
                console.log(res);
            })

        // js 版本
        // function fib(x) {
        //     if (x <= 0) {
        //         return 0;
        //     }
        //     if (x <= 2) {
        //         return 1;
        //     }
        //     return fib(x - 1) + fib(x - 2);
        // }
        // console.time('lib');
        // const res = fib(40);
        // console.timeEnd('lib');
        // console.log(res);
    </script>
</head>
<body>
    
</body>
</html>
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