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This clickindex and this.index are both on the list item component, right? So the problems caused.

You should save the clickindex on the list component, and then pass it into the list item through props. The click event should bubble up to the list component, and then let the list component modify clickindex.

vue uses data-driven view methods: {

  incrementTotal: function (a) {
      for(let i=0;i<this.list.length;i++){
           if(i==(a-1)){
             this.list[i].Active=true
           }else {
             this.list[i].Active=false
           }
      }
  }
  這事我寫(xiě)的方法