初始化提交

frontend/src/utils/pwa.js

@@ -0,0 +1,24 @@
+let request;
+
+let isInstallable = false;
+
+// The file is not useful now.
+window.addEventListener('beforeinstallprompt', (r) => {
+    console.log('beforeinstallprompt')
+	// Prevent Chrome 67 and earlier from automatically showing the prompt
+	r.preventDefault()
+	request = r
+	isInstallable = true;
+});
+
+export async function installPWA() {
+    if (request) {
+        console.log('start install')
+        let installResponse = await request.prompt();
+        console.info({installResponse});
+        return installResponse.outcome === 'accepted';
+    } else {
+        console.log('The request is not available');
+        return false;
+    }
+}