github.com/aykevl/tinygo@v0.5.0/src/examples/wasm/main/index.html (about)

     1  <!doctype html>
     2  <!--
     3  Copyright 2018 The Go Authors. All rights reserved.
     4  Use of this source code is governed by a BSD-style
     5  license that can be found in the LICENSE file.
     6  -->
     7  <html>
     8  
     9  <head>
    10  	<meta charset="utf-8">
    11  	<title>Go wasm</title>
    12  </head>
    13  
    14  <body>
    15  	<!--
    16  	Add the following polyfill for Microsoft Edge 17/18 support:
    17  	<script src="https://cdn.jsdelivr.net/npm/text-encoding@0.7.0/lib/encoding.min.js"></script>
    18  	(see https://caniuse.com/#feat=textencoder)
    19  	-->
    20  	<script src="wasm_exec.js"></script>
    21  	<script>
    22  		if (!WebAssembly.instantiateStreaming) { // polyfill
    23  			WebAssembly.instantiateStreaming = async (resp, importObject) => {
    24  				const source = await (await resp).arrayBuffer();
    25  				return await WebAssembly.instantiate(source, importObject);
    26  			};
    27  		}
    28  
    29  		const go = new Go();
    30  		let mod, inst;
    31  		WebAssembly.instantiateStreaming(fetch("wasm.wasm"), go.importObject).then((result) => {
    32  			mod = result.module;
    33  			inst = result.instance;
    34  			document.getElementById("runButton").disabled = false;
    35  		}).catch((err) => {
    36  			console.error(err);
    37  		});
    38  
    39  		async function run() {
    40  			console.clear();
    41  			await go.run(inst);
    42  			inst = await WebAssembly.instantiate(mod, go.importObject); // reset instance
    43  		}
    44  	</script>
    45  
    46  	<button onClick="run();" id="runButton" disabled>Run</button>
    47  </body>
    48  
    49  </html>