const _createPage = (allItem, pageItem) => {
                // 補(bǔ)全代碼
                let length = 0;
                let oUl = document.querySelector('ul');
                if(allItem%pageItem===0){
                    length = allItem/pageItem
                }else{
                    length = (allItem+1)/pageItem
                }
                for(let i= 0;i<length;i++){
                    let li = document.createElement('li');
                    li.innerText = i+1;
                    oUl.append(li);
                }
                
            }