题解 | #数组排序#

通过sort进行比较

    <script>
        var cups = [
            { type: 1, price: 100, color: 'black', sales: 3000, name: '牛客logo马克杯' },
            { type: 2, price: 40, color: 'blue', sales: 1000, name: '无盖星空杯' },
            { type: 4, price: 60, color: 'green', sales: 200, name: '老式茶杯' },
            { type: 3, price: 50, color: 'green', sales: 600, name: '欧式印花杯' }
        ]
        var ul = document.querySelector('ul');
        var upbtn = document.querySelector('.up');
        var downbtn = document.querySelector('.down');
        // 补全代码
        // 升序
        let up=function(){
            return cups.sort((a,b)=>a.sales-b.sales)
        }
        // 降序
        let down=function(){
            return cups.sort((a,b)=>b.sales-a.sales)
        }
        // 获取展示的数据
        let getCupsName=function(){
            var str=''
            for(var i=0;i<cups.length;i++){
                str+='<li>'+cups[i].name+'</li>'
            }
            return str
        }
        // 点击升序
        upbtn.onclick=function(){
            up()
            ul.innerHTML=getCupsName()
        }
        // 降序
        downbtn.onclick=function(){
            down()
            ul.innerHTML=getCupsName()
        }
    </script>
</body>