computed:{
        // 中間頁陣列
        $pages(){
            const foldPage = this.foldPage 
            const current = Number(this.current)
            const halfFoldPage = Math.floor((foldPage-2)/2) 

            if (this.$last > foldPage){
                if (current - halfFoldPage > 2){
                    
 
this.showPreMore = true
                }else {
                    this.showPreMore = false
                }

                if (current + halfFoldPage < this.$last){
                    this.showNextMore = true
                }else {
                    this.showNextMore = false
                }
            }

            let array 
 
= []

            // folder1顯示
            if (this.showNextMore && !this.showPreMore){
                for(let i = 2; i < foldPage; i++){
                    array.push(i)
                }
            // folder1 和 folder2都顯示
            }else if ( this.showPreMore && this.showNextMore ){
                
 
for(let i = current - halfFoldPage; i <= current + halfFoldPage; i++ ){
                    array.push(i)
                }
            // folder2顯示
            }else if (!this.showNextMore && this.showPreMore){
                // 當folder2顯示的時候,頁碼不能大於$last,需要往前多顯示差額
                let dis = current + halfFoldPage - this.$last + 1;

                for(let i = current - halfFoldPage - dis ; i < this.$last; i++){
                    array.push(i)
                }
            // 都不顯示
            }else {
                for(let i = 2; i < this.$last; i++){
                    array.push(i)
                }
            }
            return array
        },
        // 總頁數
        $last(){                         
            return Math.ceil(this.total/this.size)
        }
    }