vue3中的watch默认deep为true
经踩坑发现，下面俩种情况不会开启
1 当监视的对象author属性obj也为对象时，必须开启deep
const author = reactive({
name: 'John Doe',
obj:{id:0,t:2},
books: [
'Vue 2 - Advanced Guide',
'Vue 3 - Basic Guide',
'Vue 4 - The Mystery'
],
bage: computed(()=>{
return count.value+1
})
})
2 当监视的对象count 为ref定义的对象时，必须开启deep
let count = ref({
id:0
})