测试

mTest/index.js

@@ -15,6 +15,7 @@ const addBtn = document.querySelector('.add-button');
 addBtn.style.display = 'none';
 
 window.addEventListener('beforeinstallprompt', (e) => {
+  setTimeout(function() {
       // Prevent Chrome 67 and earlier from automatically showing the prompt
       e.preventDefault();
       // Stash the event so it can be triggered later.
@@ -37,4 +38,6 @@ window.addEventListener('beforeinstallprompt', (e) => {
           deferredPrompt = null;
         });
       });
+  }, 5000);
+
 });
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