data:{
 // 全名
 fullname:{
    full:""
    name:""
},
userName:""
},

<!-- 創(chuàng)建一個容器 -->
    <form class="app">
        <input type="button" value="重置" @click="reset">
        <!-- 差值語法 == v-model -->
        <div class="box" >
            <div class="title">深度監(jiān)視</div>
            請輸入：<input type="text" v-model="fullName.full"><br>
            請輸入：<input type="text" v-model="fullName.name">
            <!-- 使用深度監(jiān)視 -->
            <div class="content">{{userName}}</div>
        </div>
    </form>

<script>
    var vm = new Vue({
      el: '.app',
      data: {
        // 全名
        fullName:{
            full:"",
            name:""
        },
        userName:""
      },
      methods:{
        // 清除fullName的值
        reset(){
            this.fullName.full = ""
            this.fullName.name = ""
        }
      },
      // 對fullName進(jìn)行監(jiān)視
      watch:{
        fullName:{
            deep:true,
            handler(){ 
                this.userName = this.fullName.full + "-" + this.fullName.name
            }
        }
      }
      
    });
</script>

this.userName = this.fullName.full + "-" + this.fullName.name

// 對fullName進(jìn)行監(jiān)視
      watch:{
        'fullName.full':{
            handler(newValue){
                // 新增一個定時器
                setTimeout(()=>{
                    this.userName = newValue + "-" + this.fullName.name
                },1000)
            }
        },
        'fullName.name':{
            handler(newValue){
                this.userName = this.fullName.full + "-" + newValue;
            }
        }
      }

//配置計(jì)算屬性
computed:{
    //完整寫法
    /* fullname:{...
    // 簡寫形式
    /*fullName:funaction(){...
    fullName(){
      return this.full + "-" + this.name
  }
}

// 對fullName進(jìn)行監(jiān)視
watch:{
 fullName:{
     deep:true,
     handler(){
          this.userName = this.fullName.full + "-" +this.fullName.name
	  }
	 }
}