this.$watch(),this.$set(),this.$nextTick()=>{})

///組件生命周期 掛載到html文檔中
//this.$watch可以下載mounted和update這種但是不能在methods中

mounted () {
    this.$watch('value.show',newValue=>{
        if (newValue){
            this.value.formData.learnPlanId = this.value.formData.id;
            delete this.value.formData.id;
            this.reset = false;
            this.$nextTick(()=>{
                this.reset = true;
            });
        }else {
            this.value.formData = {};
        }
    })
},


///這種主要用於當對象中某個屬性值動態生成時處理方式this.$se()會在事件的下一次空閑時間執行，不知道什么時候執行但是一定會執行

const t = Number(this.value.formData.inTotal);
this.selectedQuestion.questionCount = t;
this.$set(this.selectedQuestion, 'questionCount', t);

///$nextTick 是在下次 DOM 更新循環結束之后執行延遲回調

 this.$nextTick(()=>{
                this.reset = true;
            });