Add syscall/js.valueInvoke support

src/examples/wasm/invoke/wasm.js

@@ -0,0 +1,43 @@
+'use strict';
+
+const WASM_URL = 'wasm.wasm';
+
+var wasm;
+
+function updateRight() {
+    const value = document.getElementById("a").value;
+    window.runner(function (value) {
+        document.getElementById("b").value = value;
+    }, value);
+}
+
+function updateLeft() {
+    const value = document.getElementById("b").value;
+    window.runner(function (value) {
+        document.getElementById("a").value = value;
+    }, value);
+}
+
+function init() {
+    document.querySelector('#a').oninput = updateRight;
+    document.querySelector('#b').oninput = updateLeft;
+
+    const go = new Go();
+    if ('instantiateStreaming' in WebAssembly) {
+        WebAssembly.instantiateStreaming(fetch(WASM_URL), go.importObject).then(function (obj) {
+            wasm = obj.instance;
+            go.run(wasm);
+        })
+    } else {
+        fetch(WASM_URL).then(resp =>
+            resp.arrayBuffer()
+        ).then(bytes =>
+            WebAssembly.instantiate(bytes, go.importObject).then(function (obj) {
+                wasm = obj.instance;
+                go.run(wasm);
+            })
+        )
+    }
+}
+
+init();