简易明了，需要的小伙伴直接走起！

<template><div><div><p>{{ text }}</p></div></div>
</template><script setup>
import { onMounted, ref } from "vue";const shuzu = ref("欢迎来到这个世界！");
const index = ref(0);
const text = ref('');onMounted(()=>{setInterval(()=>{atuoPlay()},500)
})
const atuoPlay = () => {index.value++;text.value = shuzu.value.slice(0, index.value);index.value = text.value.length === shuzu.value.length ? 0 : index.value;
};
</script>