vue3.0 watchEffect 如何监听一个值去修改另一个值

Question

2.0写法

```
data(){
return {
a: 0,
b:false
}
},
watch: {
a(){
this.b = true
}
}

```}

Answer 1

cosnt a = ref(0);
const b = ref(false);
watch(a, () => {
b.value = true;
});