wepy repeat标签循环渲染bug解决

//父组件
        <repeat for="{{subjectFinal.finish}}" key="index" index="index" item="item">
          <SubjectCard :item.sync="item" :isFinished.sync="true"/>
        </repeat>
//子组件
.....
     methods = {
    togle(e) {
      // todo 循环渲染出来的组件共享一个实例。
      this.show = !this.show;
    }
  };
  .....

//父
.....
  events = {
    "showchange": (index) =>{
      this.shows[index] = !this.shows[index];
    }
  }
.....
        <repeat for="{{finishSubject}}" key="index" index="index">
          <SubjectCard :item.sync="item" :isFinished="true" :show.sync="shows[index]"/>
        </repeat>
//子
  methods = {
    togle(e) {
            this.$emit("showchange",this.$index);
    }
  };