SOURCE

console 命令行工具 X clear

                    
>
console
var cups = [
    { type: 1, price: 100, color: 'black', sales: 60, name: '牛客logo马克杯' },
    { type: 2, price: 40, color: 'blue', sales: 100, 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 select = document.querySelector('select');
var ul = document.querySelector('ul');
// 补全代码
function ArrFilter(...sales) {
    let sal = [...sales]
    if (sal.length < 2) {
        if (sal[0] < 500)
            return cups.filter((a) => a.sales < sal[0]);
        else
            return cups.filter((a) => a.sales > sal[0]);
    } else {
        return cups.filter((a) => sal[0] <= a.sales && a.sales < sal[1]);
    }
}

function RenderList(arr) {
    let str = ''
    arr.forEach(item => { str += `<li>${item.name}</li>` })
    ul.innerHTML = str;
}

select.onchange = function()  {
    if (this.value == 1) RenderList(ArrFilter(100));
    if (this.value == 2) RenderList(ArrFilter(100, 500));
    if (this.value == 3) RenderList(ArrFilter(500));
}
<select name="" id="">
            <option value="0">请选择销量范围</option>
            <option value="1">&lt100</option>
            <option value="2">100~500</option>
            <option value="3">&gt500</option>
</select>
<ul>
    <li>牛客logo马克杯</li>
    <li>无盖星空杯</li>
    <li>老式茶杯</li>
    <li>欧式印花杯</li>
</ul>