题解 | #数组过滤#
数组过滤
https://www.nowcoder.com/practice/46d607f9bf64458daa8798339a7336d0
我想从封装的角度完成这道题，只需给一个范围值 筛选即可。有没有更好的方法。
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
</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');
select.onchange = (e) => {
const index = select.value
const currentCup = cups
let newCups = []
switch(index) {
case '1':
newCups = filterCup(0, 100)
break
case '2':
newCups = filterCup(100, 500, true)
break
case '3':
newCups = filterCup(500, '')
break
default:
newCups = cups
}
// 渲染
let s = ``
for (const item of newCups) {
s += `<li>${item.name}</li>`
}
ul.innerHTML = s
}
function filterCup(min, max, contain) { // contain是否个范围值 包含自身
if (contain) {
min --
max ++
}
return cups.filter(c => max ? (c.sales > min && c.sales < max) : c.sales > min)
}
</script>
</body>
</html>
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