From e291146093b91e8d36d339a8e8993e5aa1d5df29 Mon Sep 17 00:00:00 2001
From: likui <2218301630@qq.com>
Date: Wed, 3 Jun 2020 16:30:21 +0800
Subject: [PATCH] fix: should can re-mount after unmount

fix #1287
---
 packages/runtime-core/__tests__/apiCreateApp.spec.ts | 3 +++
 packages/runtime-core/src/apiCreateApp.ts            | 1 +
 2 files changed, 4 insertions(+)

diff --git a/packages/runtime-core/__tests__/apiCreateApp.spec.ts b/packages/runtime-core/__tests__/apiCreateApp.spec.ts
index fbc784f44d4..b6a622bf784 100644
--- a/packages/runtime-core/__tests__/apiCreateApp.spec.ts
+++ b/packages/runtime-core/__tests__/apiCreateApp.spec.ts
@@ -65,6 +65,9 @@ describe('api: createApp', () => {
 
     app.unmount(root)
     expect(serializeInner(root)).toBe(``)
+    // #1287 should can re-mount after unmount
+    app.mount(root)
+    expect(serializeInner(root)).toBe(`0`)
   })
 
   test('provide', () => {
diff --git a/packages/runtime-core/src/apiCreateApp.ts b/packages/runtime-core/src/apiCreateApp.ts
index 4e3079e436f..00febf4c12c 100644
--- a/packages/runtime-core/src/apiCreateApp.ts
+++ b/packages/runtime-core/src/apiCreateApp.ts
@@ -233,6 +233,7 @@ export function createAppAPI<HostElement>(
       unmount() {
         if (isMounted) {
           render(null, app._container)
+          isMounted = false
         } else if (__DEV__) {
           warn(`Cannot unmount an app that is not mounted.`)
         }