发表于： 2023-03-13 20:01:54
0 277
今天的js知识：
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta name="viewport"
content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
</head>
<body>
<script>
const arr = [10, 20, 30]
// filter 筛选数组符合条件的元素，并返回筛选之后元素的新数组
// const newArr = arr.filter(function (item, index) {
// // console.log(item)
// // console.log(index)
// return item >= 20
// })
const newArr = arr.filter(item => item >= 20)
console.log(newArr)
</script>
</body>
</html>
<!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>商品渲染</title>
<style>
* {
margin: 0;
padding: 0;
box-sizing: border-box;
}
.list {
width: 990px;
margin: 0 auto;
display: flex;
flex-wrap: wrap;
}
.item {
width: 240px;
margin-left: 10px;
padding: 20px 30px;
transition: all .5s;
margin-bottom: 20px;
}
.item:nth-child(4n) {
margin-left: 0;
}
.item:hover {
box-shadow: 0px 0px 5px rgba(0, 0, 0, 0.2);
transform: translate3d(0, -4px, 0);
cursor: pointer;
}
.item img {
width: 100%;
}
.item .name {
font-size: 18px;
margin-bottom: 10px;
color: #666;
}
.item .price {
font-size: 22px;
color: firebrick;
}
.item .price::before {
content: "¥";
font-size: 14px;
}
.filter {
display: flex;
width: 990px;
margin: 0 auto;
padding: 50px 30px;
}
.filter a {
padding: 10px 20px;
background: #f5f5f5;
color: #666;
text-decoration: none;
margin-right: 20px;
}
.filter a:active,
.filter a:focus {
background: #05943c;
color: #fff;
}
</style>
</head>
<body>
<div class="filter">
<a data-index="1" href="javascript:;">0-100元</a>
<a data-index="2" href="javascript:;">100-300元</a>
<a data-index="3" href="javascript:;">300元以上</a>
<a href="javascript:;">全部区间</a>
</div>
<div class="list">
<!-- <div class="item">
<img src="" alt="">
<p class="name"></p>
<p class="price"></p>
</div> -->
</div>
<script>
// 2. 初始化数据
const goodsList = [
{
id: '4001172',
name: '称心如意手摇咖啡磨豆机咖啡豆研磨机',
price: '289.00',
picture: 'https://yanxuan-item.nosdn.127.net/84a59ff9c58a77032564e61f716846d6.jpg',
},
{
id: '4001594',
name: '日式黑陶功夫茶组双侧把茶具礼盒装',
price: '288.00',
picture: 'https://yanxuan-item.nosdn.127.net/3346b7b92f9563c7a7e24c7ead883f18.jpg',
},
{
id: '4001009',
name: '竹制干泡茶盘正方形沥水茶台品茶盘',
price: '109.00',
picture: 'https://yanxuan-item.nosdn.127.net/2d942d6bc94f1e230763e1a5a3b379e1.png',
},
{
id: '4001874',
name: '古法温酒汝瓷酒具套装白酒杯莲花温酒器',
price: '488.00',
picture: 'https://yanxuan-item.nosdn.127.net/44e51622800e4fceb6bee8e616da85fd.png',
},
{
id: '4001649',
name: '大师监制龙泉青瓷茶叶罐',
price: '139.00',
picture: 'https://yanxuan-item.nosdn.127.net/4356c9fc150753775fe56b465314f1eb.png',
},
{
id: '3997185',
name: '与众不同的口感汝瓷白酒杯套组1壶4杯',
price: '108.00',
picture: 'https://yanxuan-item.nosdn.127.net/8e21c794dfd3a4e8573273ddae50bce2.jpg',
},
{
id: '3997403',
name: '手工吹制更厚实白酒杯壶套装6壶6杯',
price: '99.00',
picture: 'https://yanxuan-item.nosdn.127.net/af2371a65f60bce152a61fc22745ff3f.jpg',
},
{
id: '3998274',
name: '德国百年工艺高端水晶玻璃红酒杯2支装',
price: '139.00',
picture: 'https://yanxuan-item.nosdn.127.net/8896b897b3ec6639bbd1134d66b9715c.jpg',
},
]
//渲染数据
function render(arr) {
//利用map遍历
const newArr = arr.map(item => {
//对象解构
const { name, price, picture } = item
return `
<div class="item">
<img src="${picture}" alt="">
<p class="name">${name}</p>
<p class="price">${price}</p>
</div>
`
})
document.querySelector('.list').innerHTML = newArr.join('')
}
render(goodsList)
//筛选对应的商品
//给所有的a注册点击事件
//然后判断点的是哪一个
//然后利用filter筛选出对应的元素放到新数组里,然后重新渲染数据
//获取元素
const a = document.querySelectorAll('.filter a')
//循环注册点击事件
for (let i = 0; i < a.length; i++) {
a[i].addEventListener('click', function () {
//获取自定义属性
const index = +this.dataset.index
//定义一个空数组
// let arr = []
// if (index === 1) {
// arr = goodsList.filter(function (item) {
// const { price } = item
// return price > 0 && price <= 100
// })
// } else if (index === 2) {
// arr = goodsList.filter(function (item) {
// const { price } = item
// return price >= 100 && price <= 300
// })
// } else if (index === 3) {
// arr = goodsList.filter(function (item) {
// const { price } = item
// return price >= 300
// })
// } else {
// arr = goodsList
// }
//定义一个空数组
let arr = []
if (index === 1) {
arr = goodsList.filter(item => item.price > 0 && item.price <= 100)
} else if (index === 2) {
arr = goodsList.filter(item => item.price >= 100 && item.price <= 300)
} else if (index === 3) {
arr = goodsList.filter(item => item.price >= 300)
}else {
arr = goodsList
}
// 渲染函数
render(arr)
})
}
// document.querySelector('.filter').addEventListener('click', e => {
// const { tagName, dataset } = e.target
// if (tagName === 'A') {
// if (dataset.index === '1') {
// arr = goodsList.filter(item => item.price > 0 && item.price <= 100)
// } else if (dataset.index === '2') {
// arr = goodsList.filter(item => item.price >= 100 && item.price <= 300)
// } else if (dataset.index === '3') {
// arr = goodsList.filter(item => item.price >= 300)
// } else {
// arr = goodsList
// }
// }
// render(arr)
// })
</script>
</body>
</html>
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