vue computed写法与传参

// vue2
computed: {
  fullName() {
      return this.firstName + this.lastName;
  }
}
// 传参
computed: {
  fullName() {
    return (params) => {
      
    }
  }
}

// vue3
const newName = computed(() => {
  return name.value + 5     // 注意 ref 包装过的值在value中
})
const newName = computed(() => (item: any) => {
  return item.id==='123'
})