composition-api的computed出问题

Question

核心代码

function useFormDialog(options={}){
    const {baseTitle}=options;
    
    const [isAdd,{setTrue:setAdd,setFalse:setEdit}]=useBoolean(true);
    
    const title=computed(()=>(isAdd.value?'新增':'编辑')+baseTitle);
    
    return {
        isAdd,title
    }
}

<template>{{title}}</template>
setup(){
const {title}=userFormDialog();
return {title}
}