vue3.0项目迁移后，swiper.vue组件里报错

来源：2-5 【讨论题】你所知道的常用设计模式有哪些？

刘大大美

2021-04-22

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Uncaught (in promise) TypeError: Cannot read property ‘length’ of undefined
at eval (Swiper.vue?807e:24)
at ComputedRefImpl.reactiveEffect [as effect] (reactivity.esm-bundler.js?a1e9:42)
at ComputedRefImpl.get value [as value] (reactivity.esm-bundler.js?a1e9:861)
at unref (reactivity.esm-bundler.js?a1e9:775)
at Object.get (reactivity.esm-bundler.js?a1e9:778)
at Proxy.eval (Swiper.vue?807e:2)
at renderComponentRoot (runtime-core.esm-bundler.js?5c40:846)
at componentEffect (runtime-core.esm-bundler.js?5c40:4280)
at reactiveEffect (reactivity.esm-bundler.js?a1e9:42)
at effect (reactivity.esm-bundler.js?a1e9:17)