题解 | #数组过滤#
数组过滤
https://www.nowcoder.com/practice/46d607f9bf64458daa8798339a7336d0
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<select name="" id="">
<option value="0">请选择销量范围</option>
<option value="1"><100</option>
<option value="2">100~500</option>
<option value="3">>500</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>
<script>
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
// 分类
let lessList = [];
let centerList = [];
let moreList = [];
for (let i = 0, l = cups.length; i < l; i++) {
if (cups[i].sales < 100) {
lessList.push(cups[i]);
}
else if (cups[i].sales > 500) {
moreList.push(cups[i]);
} else {
centerList.push(cups[i]);
}
}
// 封装渲染函数
function render(arr) {
// 清空原ul
ul.innerHTML = '';
let frg = document.createDocumentFragment();
for (let item of arr) {
let li = document.createElement('li');
li.innerHTML = item.name;
frg.appendChild(li);
}
ul.appendChild(frg);
}
select.onchange = () => {
let val = select.value;
if (val == 1) {
render(lessList);
} else if (val == 2) {
render(centerList);
}
else if (val == 3) {
render(moreList);
} else {
// 未选择时显示全部商品
render(cups);
}
}
</script>
</body>
</html>
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