Created
June 15, 2018 08:52
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| // +build ignore | |
| package main | |
| func add(a, b int) int { | |
| return a + b | |
| } | |
| func main() { | |
| } |
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| package main | |
| import ( | |
| "flag" | |
| "fmt" | |
| "io" | |
| "log" | |
| "net/http" | |
| "os" | |
| ) | |
| func main() { | |
| addr := flag.String("addr", ":5555", "server address:port") | |
| flag.Parse() | |
| http.HandleFunc("/", rootHandle) | |
| http.HandleFunc("/wasm", wasmHandle) | |
| log.Printf("listening on %q...", *addr) | |
| log.Fatal(http.ListenAndServe(*addr, nil)) | |
| } | |
| func rootHandle(w http.ResponseWriter, r *http.Request) { | |
| fmt.Fprintf(w, page) | |
| } | |
| func wasmHandle(w http.ResponseWriter, r *http.Request) { | |
| w.Header().Set("Content-Type", "application/wasm") | |
| f, err := os.Open("js") | |
| if err != nil { | |
| http.Error(w, err.Error(), http.StatusServiceUnavailable) | |
| return | |
| } | |
| io.Copy(w, f) | |
| } | |
| const page = ` | |
| <html> | |
| <head> | |
| <title>Testing WebAssembly</title> | |
| <script type="text/javascript"> | |
| function fetchAndInstantiate(url, obj) { | |
| return fetch(url).then(resp => | |
| resp.arrayBuffer() | |
| ).then(buf => | |
| WebAssembly.instantiate(buf, obj) | |
| ).then(results => | |
| results.instance | |
| ); | |
| } | |
| var mod = fetchAndInstantiate("/wasm", {}); | |
| window.onload = function() { | |
| mod.then(function(instance) { | |
| var div = document.getElementById("wasm-result"); | |
| div.innerHTML = "<code>add(1, 2)= " + instance.exports.add(1, 2) + "</code>"; | |
| }); | |
| }; | |
| </script> | |
| </head> | |
| <body> | |
| <div id="wasm-result"><code>add(1, 2)= N/A</code></div> | |
| </body> | |
| </html> | |
| ` |
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