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const { proxy } = getCurrentInstance()

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import { ComponentInternalInstance, getCurrentInstance } from 'vue'

export default function useCurrentInstance() {

    const { appContext } = getCurrentInstance() as ComponentInternalInstance

    const proxy = appContext.config.globalProperties

    return {

        proxy

    }

}

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<script lang="ts">

import { defineComponent } from "vue";

import useCurrentInstance from "@/utils/useCurrentInstance";

export default defineComponent({

  setup() {

    const { proxy } = useCurrentInstance();

    console.log(proxy);

  },

});

</script>

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const instance = getCurrentInstance() 

const a1= getCurrentInstance();

a1.$toast({type: 'error', text: '登录失败' });

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const instance = getCurrentInstance()?.proxy  

 instance ?.$toast('请xxx！')