vue 3.0 ref Watch

// 监听一个ref定义的数据
watch(num, (newValue, oldValue) => {
  console.log("num增加了", newValue, oldValue);
},{ immediate: true, deep: true });

// 监听多个ref定义的数据
watch([num, num1], (newValue, oldValue) => {
  console.log("num增加了", newValue, oldValue);
});