Monitor complex data types in vue

Listen to basic types

 watch: {
     "被监听的属性名" (newVal, oldVal){
         
     }
 }

Monitor complex data types

"要监听的属性名": {
        immediate: true, // 立即执行
        deep: true, // 深度监听复杂类型内变化
        handler (newVal, oldVal) {  //handler固定方法触发
             
        }
}