vue 是先渲染 template 还是 script 呢？-灵析社区

--> import { ref, reactive, computed } from "vue"; const formState = reactive({ limit: 20, offset: 0, }); const offsetPlusOne = computed(() => { // return formState.value ? formState.value.offset + 1 : 0; return formState.value.offset + 1 }); 代码如上，首次加载界面会有报错 `TypeError: formState.value is undefined` [Vue warn]: Unhandled error during execution of render function at ref=Ref > at at runtime-core.esm-bundler.js:41 [Vue warn]: Unhandled error during execution of scheduler flush. This is likely a Vue internals bug. Please open an issue at https://new-issue.vuejs.org/?repo=vuejs/core at ref=Ref > at at runtime-core.esm-bundler.js:41 Uncaught (in promise) TypeError: formState.value is undefined offsetPlusOne Demo.vue:21 run reactivity.esm-bundler.js:178 get value reactivity.esm-bundler.js:1147 unref reactivity.esm-bundler.js:1026 get reactivity.esm-bundler.js:1032 render Demo.vue:3 renderComponentRoot runtime-core.esm-bundler.js:815 componentUpdateFn runtime-core.esm-bundler.js:5701 run reactivity.esm-bundler.js:178 update runtime-core.esm-bundler.js:5814 setupRenderEffect runtime-core.esm-bundler.js:5822 mountComponent runtime-core.esm-bundler.js:5612 processComponent runtime-core.esm-bundler.js:5565 patch runtime-core.esm-bundler.js:5040 componentUpdateFn runtime-core.esm-bundler.js:5773 run reactivity.esm-bundler.js:178 update runtime-core.esm-bundler.js:5814 callWithErrorHandling runtime-core.esm-bundler.js:158 flushJobs runtime-core.esm-bundler.js:357 promise callback*queueFlush runtime-core.esm-bundler.js:270 queuePostFlushCb runtime-core.esm-bundler.js:290 queueEffectWithSuspense runtime-core.esm-bundler.js:1603 scheduler runtime-core.esm-bundler.js:1773 triggerEffect reactivity.esm-bundler.js:373 triggerEffects reactivity.esm-bundler.js:363 triggerRefValue reactivity.esm-bundler.js:974 effect reactivity.esm-bundler.js:1135 triggerEffect reactivity.esm-bundler.js:373 triggerEffects reactivity.esm-bundler.js:358 triggerRefValue reactivity.esm-bundler.js:974 effect reactivity.esm-bundler.js:1135 triggerEffect reactivity.esm-bundler.js:373 triggerEffects reactivity.esm-bundler.js:358 triggerRefValue reactivity.esm-bundler.js:974 set value reactivity.esm-bundler.js:1018 finalizeNavigation vue-router.mjs:3355 pushWithRedirect vue-router.mjs:3220 promise callback*pushWithRedirect vue-router.mjs:3186 push vue-router.mjs:3112 install vue-router.mjs:3551 use runtime-core.esm-bundler.js:3752 main.js:13 js app.js:151 __webpack_require__ app.js:593 __webpack_exports__ app.js:1714 O app.js:639 app.js:1715 app.js:1717 Demo.vue:21 ​ 我已经把 formState 写在 offsetPlusOne 前面了，为什么执行 offsetPlusOne 的时候，还会报错 `TypeError: formState.value is undefined`