从零开始学前端：程序猿小白也可以完全掌握！—今天你学习了吗？（JS）

复习：从零开始学前端：对象序列化与反序列化、冒泡排序、数组去重 — 今天你学习了吗？（JS：Day11）

文章目录

从零开始学前端：程序猿小白也可以完全掌握！—今天你学习了吗？（JS）
- 前言
- 第十二节课：购物车和鲜花价格排序的案例
- - 一、购物车
  - 二、鲜花价格排序

前言

补齐了，要了老命了。

第十二节课：购物车和鲜花价格排序的案例

一、购物车

效果图：

我的代码：

<!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><style>* {margin: 0;padding: 0;}li {list-style: none;}#box {margin: 50px auto;width: 997px;height: 455px;user-select: none;}#box .head {width: 1000px;height: 50px;}#box .head li {float: left;width: 248px;height: 48px;border: 1px solid #fc87d8;border-right: 1px solid #fc87d8;background: #fc87d8;text-align: center;line-height: 50px;color: white;font-weight: bold;font-size: 14px;}#content {width: 998px;border-left: 1px solid #fc87d8;border-right: 1px solid #fc87d8;overflow: hidden;}#content ul {width: 1000px;border-bottom: 1px solid #fc87d8;overflow: hidden;}#content ul li {float: left;width: 248.75px;height: 100px;border-right: 1px solid #fc87d8;text-align: center;line-height: 100px;position: relative;}#content ul li img {position: absolute;left: 0;top: 0;bottom: 0;right: 0;margin: auto;width: 90px;}#content ul li.num span {display: inline-block;width: 30px;height: 30px;border: 1px solid #ddd;line-height: 30px;margin: 35px auto;font-weight: bold;}#content ul li.num span.jia,#content ul li.num span.jian {background: #ddd;cursor: pointer;}#content ul li.num span.shuliang {width: 70px;}#foot {/* margin: 10px auto; */width: 1000px;height: 50px;background: #fc87d8;}#foot p {width: 250px;float: right;text-align: center;line-height: 50px;color: white;}#foot p span {color: deeppink;font-size: 20px;font-weight: bold;}</style>
</head><body><div id="box"><ul class='head'><li>商品</li><li>单价</li><li>数量</li><li>小计</li></ul><div id="content"><ul><li class='img'><img src="data:images/1.webp"></li><li class='danjia'>8</li><li class='num'><span class='jian'>-</span><span class='shuliang'>0</span><span class='jia'>+</span></li><li class='xiaoji'>0</li></ul><ul><li class='img'><img src="data:images/2.webp"></li><li class='danjia'>10</li><li class='num'><span class='jian'>-</span><span class='shuliang'>0</span><span class='jia'>+</span></li><li class='xiaoji'>0</li></ul><ul><li class='img'><img src="data:images/3.webp"></li><li class='danjia'>12.5</li><li class='num'><span class='jian'>-</span><span class='shuliang'>0</span><span class='jia'>+</span></li><li class='xiaoji'>0</li></ul><ul><li class='img'><img src="data:images/4.webp"></li><li class='danjia'>23</li><li class='num'><span class='jian'>-</span><span class='shuliang'>0</span><span class='jia'>+</span></li><li class='xiaoji'>0</li></ul></div><div id="foot"><p>合计费用￥ <span class='zongjia'>0</span></p><p>已选中商品: <span class='zongshu'>0</span> 个</p></div></div><script>var jia = document.getElementsByClassName("jia"),jian = document.getElementsByClassName("jian"),shuliang = document.getElementsByClassName("shuliang"),danjia = document.getElementsByClassName("danjia"),xiaoji = document.getElementsByClassName("xiaoji"),zongjia = document.getElementsByClassName("zongjia")[0],zongshu = document.getElementsByClassName("zongshu")[0];for (var i = 0; i < shuliang.length; i++) {jia[i].i = ijia[i].onclick = function () {shuliang[this.i].innerHTML++xiaoji[this.i].innerHTML = Number(danjia[this.i].innerHTML) * Number(shuliang[this.i].innerHTML)zongshu.innerHTML = Number(shuliang[0].innerHTML) + Number(shuliang[1].innerHTML) + Number(shuliang[2].innerHTML) + Number(shuliang[3].innerHTML)zongjia.innerHTML = Number(xiaoji[0].innerHTML) + Number(xiaoji[1].innerHTML) + Number(xiaoji[2].innerHTML) + Number(xiaoji[3].innerHTML)}jian[i].i = ijian[i].onclick = function () {if (shuliang[this.i].innerHTML != 0) {shuliang[this.i].innerHTML--xiaoji[this.i].innerHTML = Number(danjia[this.i].innerHTML) * Number(shuliang[this.i].innerHTML)zongshu.innerHTML = Number(shuliang[0].innerHTML) + Number(shuliang[1].innerHTML) + Number(shuliang[2].innerHTML) + Number(shuliang[3].innerHTML)zongjia.innerHTML = Number(xiaoji[0].innerHTML) + Number(xiaoji[1].innerHTML) + Number(xiaoji[2].innerHTML) + Number(xiaoji[3].innerHTML)}}}</script></body></html>

教学代码：

<!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><style>* {margin: 0;padding: 0;}li {list-style: none;}#box {margin: 50px auto;width: 997px;height: 455px;user-select: none;}#box .head {width: 1000px;height: 50px;}#box .head li {float: left;width: 248px;height: 48px;border: 1px solid #fc87d8;border-right: 1px solid #fc87d8;background: #fc87d8;text-align: center;line-height: 50px;color: white;font-weight: bold;font-size: 14px;}#content {width: 998px;border-left: 1px solid #fc87d8;border-right: 1px solid #fc87d8;overflow: hidden;}#content ul {width: 1000px;border-bottom: 1px solid #fc87d8;overflow: hidden;}#content ul li {float: left;width: 248.75px;height: 100px;border-right: 1px solid #fc87d8;text-align: center;line-height: 100px;position: relative;}#content ul li img {position: absolute;left: 0;top: 0;bottom: 0;right: 0;margin: auto;width: 90px;}#content ul li.num span {display: inline-block;width: 30px;height: 30px;border: 1px solid #ddd;line-height: 30px;margin: 35px auto;font-weight: bold;}#content ul li.num span.jia,#content ul li.num span.jian {background: #ddd;cursor: pointer;}#content ul li.num span.shuliang {width: 70px;}#foot {/* margin: 10px auto; */width: 1000px;height: 50px;background: #fc87d8;}#foot p {width: 250px;float: right;text-align: center;line-height: 50px;color: white;}#foot p span {color: deeppink;font-size: 20px;font-weight: bold;}</style>
</head><body><div id="box"><ul class='head'><li>商品</li><li>单价</li><li>数量</li><li>小计</li></ul><div id="content"><ul><li class='img'><img src="data:images/1.webp"></li><li class='danjia'>8</li><li class='num'><span class='jian'>-</span><span class='shuliang'>0</span><span class='jia'>+</span></li><li class='xiaoji'>0</li></ul><ul><li class='img'><img src="data:images/2.webp"></li><li class='danjia'>10</li><li class='num'><span class='jian'>-</span><span class='shuliang'>0</span><span class='jia'>+</span></li><li class='xiaoji'>0</li></ul><ul><li class='img'><img src="data:images/3.webp"></li><li class='danjia'>12.5</li><li class='num'><span class='jian'>-</span><span class='shuliang'>0</span><span class='jia'>+</span></li><li class='xiaoji'>0</li></ul><ul><li class='img'><img src="data:images/4.webp"></li><li class='danjia'>23</li><li class='num'><span class='jian'>-</span><span class='shuliang'>0</span><span class='jia'>+</span></li><li class='xiaoji'>0</li></ul></div><div id="foot"><p>合计费用￥ <span class='zongjia'>0</span></p><p>已选中商品: <span class='zongshu'>0</span> 个</p></div></div><script>var jia = document.getElementsByClassName('jia'),jian = document.getElementsByClassName('jian'),shuliang = document.getElementsByClassName('shuliang'),xiaoji = document.getElementsByClassName('xiaoji'),zongshu = document.getElementsByClassName('zongshu')[0],zongjia = document.getElementsByClassName('zongjia')[0],danjia = document.getElementsByClassName('danjia');for (var i = 0; i < shuliang.length; i++) {// console.log( i )/*jian[0].i = 0jian[1].i = 1jian[2].i = 2jian[3].i = 3*/jia[i].i = i;jian[i].i = i;jia[i].onclick = function () {var num = 0;var tot = 0;shuliang[this.i].innerHTML++//shuliang * danjia = xiaojixiaoji[this.i].innerHTML = shuliang[this.i].innerHTML * danjia[this.i].innerHTML;for (var i = 0; i < danjia.length; i++) {// console.log( i )/*shuliang[0].innerHTMLshuliang[1].innerHTMLshuliang[2].innerHTMLshuliang[3].innerHTML*/// num += parseFloat(  shuliang[i].innerHTML );num += shuliang[i].innerHTML * 1;tot += xiaoji[i].innerHTML / 1}// console.log( typeof shuliang[0].innerHTML )zongshu.innerHTML = numzongjia.innerHTML = tot}jian[i].onclick = function () {var num = 0;var tot = 0;shuliang[this.i].innerHTML--//shuliang * danjia = xiaojiif (shuliang[this.i].innerHTML < 0) {shuliang[this.i].innerHTML = 0}xiaoji[this.i].innerHTML = shuliang[this.i].innerHTML * danjia[this.i].innerHTML;for (var i = 0; i < danjia.length; i++) {num += shuliang[i].innerHTML * 1;tot += xiaoji[i].innerHTML / 1}zongshu.innerHTML = numzongjia.innerHTML = tot}}</script>
</body></html>

优化后代码：

<!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><style>* {margin: 0;padding: 0;}li {list-style: none;}#box {margin: 50px auto;width: 997px;height: 455px;user-select: none;}#box .head {width: 1000px;height: 50px;}#box .head li {float: left;width: 248px;height: 48px;border: 1px solid #fc87d8;border-right: 1px solid #fc87d8;background: #fc87d8;text-align: center;line-height: 50px;color: white;font-weight: bold;font-size: 14px;}#content {width: 998px;border-left: 1px solid #fc87d8;border-right: 1px solid #fc87d8;overflow: hidden;}#content ul {width: 1000px;border-bottom: 1px solid #fc87d8;overflow: hidden;}#content ul li {float: left;width: 248.75px;height: 100px;border-right: 1px solid #fc87d8;text-align: center;line-height: 100px;position: relative;}#content ul li img {position: absolute;left: 0;top: 0;bottom: 0;right: 0;margin: auto;width: 90px;}#content ul li.num span {display: inline-block;width: 30px;height: 30px;border: 1px solid #ddd;line-height: 30px;margin: 35px auto;font-weight: bold;}#content ul li.num span.jia, #content ul li.num span.jian {background: #ddd;cursor: pointer;}#content ul li.num span.shuliang {width: 70px;}#foot {/* margin: 10px auto; */width: 1000px;height: 50px;background: #fc87d8;}#foot p {width: 250px;float: right;text-align: center;line-height: 50px;color: white;}#foot p span {color: deeppink;font-size: 20px;font-weight: bold;}</style>
</head>
<body><div id="box"><ul class='head'><li>商品</li><li>单价</li><li>数量</li><li style='border-right:1px solid #c36;'>小计</li></ul><div id="content"><ul><li class='img'><img src="data:images/1.webp"></li><li class='danjia'>8</li><li class='num'><span class='jian'>-</span><span class='shuliang'>0</span><span class='jia'>+</span></li><li class='xiaoji'>0</li></ul><ul><li class='img'><img src="data:images/2.webp"></li><li class='danjia'>10</li><li class='num'><span class='jian'>-</span><span class='shuliang'>0</span><span class='jia'>+</span></li><li class='xiaoji'>0</li></ul><ul><li class='img'><img src="data:images/3.webp"></li><li class='danjia'>12.5</li><li class='num'><span class='jian'>-</span><span class='shuliang'>0</span><span class='jia'>+</span></li><li class='xiaoji'>0</li></ul><ul><li class='img'><img src="data:images/4.webp"></li><li class='danjia'>23</li><li class='num'><span class='jian'>-</span><span class='shuliang'>0</span><span class='jia'>+</span></li><li class='xiaoji'>0</li></ul></div><div id="foot"><p>合计费用￥ <span class='zongjia'>0</span></p><p>已选中商品: <span class='zongshu'>0</span> 个</p></div></div><script>var jia = document.getElementsByClassName('jia'),jian =document.getElementsByClassName('jian'),shuliang = document.getElementsByClassName('shuliang'),xiaoji = document.getElementsByClassName('xiaoji'),zongshu = document.getElementsByClassName('zongshu')[0],zongjia = document.getElementsByClassName('zongjia')[0],danjia = document.getElementsByClassName('danjia');for( var i = 0; i < shuliang.length; i++){//绑定自定义属性;jia[i].i = i;jian[i].i = i;//右边+jia[i].onclick = function(){//绑定自定义属性，做为参数传值;var idx = this.i;shuliang[idx].innerHTML++Change(idx)}//左边-jian[i].onclick = function(){var idx = this.i;if(  --shuliang[idx].innerHTML < 0 ){shuliang[idx].innerHTML=0}Change(idx)}}function Change(idx){//定义初始值num , tot保存总量; var num = 0;var tot = 0;//xiaoji的计算;xiaoji[idx].innerHTML=shuliang[idx].innerHTML*danjia[idx].innerHTML;for( var i = 0 ; i< danjia.length ; i++){num += shuliang[i].innerHTML*1; tot += xiaoji[i].innerHTML/1}zongshu.innerHTML = numzongjia.innerHTML = tot}</script>
</body>
</html>

二、鲜花价格排序

效果图：

我的代码：

<!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><style>* {margin: 0;padding: 0;font-family: Microsoft YaHei, serif;}li {list-style: none;}#box {width: 1000px;margin: 50px auto;}#top {width: 100%;background: #f8f8f8;border: 1px solid #ddd;height: 40px;}#top li {position: relative;float: left;width: 80px;height: 40px;text-align: center;line-height: 40px;font-size: 14px;cursor: pointer;}#top li span.red {color: red;}#top li div {display: none;position: absolute;z-index: 99;top: -1px;left: 0;width: 100px;height: 80px;font-size: 14px;border: 1px solid #ddd;background: #ffffff;}#content {width: 100%;margin-top: 10px;}#content li {position: relative;float: left;margin: 5px 14px;width: 200px;height: 230px;padding: 10px;border: 1px solid #eee;}#content li img {width: 200px;height: 200px;}#content li p {font-size: 14px;}#content li div {position: absolute;bottom: 0;right: 0;width: 50px;height: 50px;background: url("images/price.png");text-align: center;line-height: 50px;color: #fff318;font-size: 14px;font-weight: bold;}</style>
</head><body><div id="box"><ul id="top"><li>流行</li><li>热销</li><li>上新</li><li class="price"><span>价格</span><div class="hide"><p>从高到底</p><p>从低到高</p></div></li></ul><ul id="content"><li><img src="data:images/xh_img1.jpg" alt=""><p>甜美七分袖荷叶边条纹设</p><div>￥<span>500</span></div></li><li><img src="data:images/xh_img2.jpg" alt=""><p>甜美七分袖荷叶边条纹设</p><div>￥<span>100</span></div></li><li><img src="data:images/xh_img3.jpg" alt=""><p>甜美七分袖荷叶边条纹设</p><div>￥<span>300</span></div></li><li><img src="data:images/xh_img4.jpg" alt=""><p>甜美七分袖荷叶边条纹设</p><div>￥<span>700</span></div></li><li><img src="data:images/xh_img5.jpg" alt=""><p>甜美七分袖荷叶边条纹设</p><div>￥<span>130</span></div></li><li><img src="data:images/xh_img6.jpg" alt=""><p>甜美七分袖荷叶边条纹设</p><div>￥<span>215</span></div></li><li><img src="data:images/xh_img7.jpg" alt=""><p>甜美七分袖荷叶边条纹设</p><div>￥<span>97</span></div></li><li><img src="data:images/xh_img8.jpg" alt=""><p>甜美七分袖荷叶边条纹设</p><div>￥<span>99.5</span></div></li></ul></div><script>var price = document.getElementsByClassName('price')[0],priceSpan = price.getElementsByTagName('span')[0],hide = document.getElementsByClassName('hide')[0],   //oHiden = hidep = hide.getElementsByTagName('p'),   //btns = pcontent = document.getElementById('content'),       //content = conlis = content.getElementsByTagName('li'),spans = content.getElementsByTagName(('span')),      //spanS = spanarr = [];// 之前做的点击事件，后来发现教学讲的是鼠标事件price.onmouseenter = function () {hide.style.display = 'block';}price.onmouseleave = function () {hide.style.display = 'none';}// 之后将价格放入数组中,我之前是与spans绑定，教学里是与li相绑定，是为了可以直接控制li的显示// 我之前的:也可以// for (var i = 0; i < spans.length; i++) {//     // *1让arr里面是数字类型//     arr[i][0] = spans[i].innerHTML * 1//     arr[i][1] = lis[i].innerHTML// }// 讲解的:构建双层数组for (var i = 0; i < lis.length; i++) {arr.push([])arr[i][0] = spans[i].innerHTML * 1arr[i][1] = lis[i].innerHTML}//   点击事件：从高到低和从低到高for (var i = 0; i < p.length; i++) {p[i].i = ip[i].onclick = function () {// 刚开始这里的i我也搞不明白，不过觉得这里直接取i时会报错，取this.i不会报错，可能是因为方法内i未定义吧。hide.style.display = 'none'// priceSpan.innerHTML = p[this.i].innerHTML//或者priceSpan.innerHTML = this.innerHTMLpriceSpan.className = 'red'// 判断是哪个选项：从高到低还是从低到高priceSort(this.i)// 商品信息置空content.innerHTML = ''// 显示商品console.log(arr[1][1])for (var i = 0; i < arr.length; i++) {content.innerHTML += '<li>' + arr[i][1] + '</li>'}}}// 在外面封装一个函数function priceSort(idx) {arr.sort(function (a, b) {// 这里的a,b表示的是二维数组里面嵌套的小数组，所以这里想要取值的话，需要使用下标// 判断升序还是降序，是0的话从高到低，降序:b[0]-a[0]；是1的话，从低到高，升序：a[0]-b[0]；return idx ? a[0] - b[0] : b[0] - a[0]})console.log(arr)}</script>
</body></html>

教学代码：

<!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><style>*{margin:0;padding:0;font-family: Microsoft YaHei,serif;}li{list-style: none;}#box{width:1000px;margin:50px auto;}#top{width:100%;background: #f8f8f8;border:1px solid #ddd;height: 40px;}#top li{position: relative;float: left;width:80px;height: 40px;text-align: center;line-height:40px;font-size:14px;cursor: pointer;}#top li span.red{color:red;}#top li div{display: none;position: absolute;z-index: 99;top:-1px;left:0;width: 100px;height: 80px;font-size:14px;border:1px solid #ddd;background: #ffffff;}#content{width:100%;margin-top:10px;}#content li{position: relative;float: left;margin:5px 14px;width:200px;height: 230px;padding:10px;border:1px solid #eee;}#content li img{width: 200px;height: 200px;}#content li p{font-size:14px;}#content li div{position: absolute;bottom:0;right:0;width: 50px;height: 50px;background: url("images/price.png");text-align: center;line-height: 50px;color: #fff318;font-size:14px;font-weight: bold;}</style>
</head>
<body><div id="box"><ul id="top"><li>流行</li><li>热销</li><li>上新</li><li class="price"><span>价格</span><div class="hide"><p>从高到底</p><p>从低到高</p></div></li></ul><ul id="content"><li><img src="data:images/xh_img1.jpg" alt=""> <p>甜美七分袖荷叶边条纹设</p><div>￥<span>500</span></div></li><li><img src="data:images/xh_img2.jpg" alt=""><p>甜美七分袖荷叶边条纹设</p><div>￥<span>100</span></div></li><li><img src="data:images/xh_img3.jpg" alt=""><p>甜美七分袖荷叶边条纹设</p><div>￥<span>300</span></div></li><li><img src="data:images/xh_img4.jpg" alt=""><p>甜美七分袖荷叶边条纹设</p><div>￥<span>700</span></div></li><li><img src="data:images/xh_img5.jpg" alt=""><p>甜美七分袖荷叶边条纹设</p><div>￥<span>130</span></div></li><li><img src="data:images/xh_img6.jpg" alt=""><p>甜美七分袖荷叶边条纹设</p><div>￥<span>215</span></div></li><li><img src="data:images/xh_img7.jpg" alt=""><p>甜美七分袖荷叶边条纹设</p><div>￥<span>97</span></div></li><li><img src="data:images/xh_img8.jpg" alt=""><p>甜美七分袖荷叶边条纹设</p><div>￥<span>99.5</span></div></li></ul></div><script>var price = document.getElementsByClassName('price')[0],PriceSpan = price.getElementsByTagName('span')[0],oHiden = document.getElementsByClassName('hide')[0],btns = oHiden.getElementsByTagName('p'),con = document.getElementById('content'),lis = con.getElementsByTagName('li'),spanS = con.getElementsByTagName('span'),arr = [];price.onmouseenter = function(){oHiden.style.display = 'block';}price.onmouseleave = function(){oHiden.style.display = 'none';}/*[[ 价格 , 对应整个li样式 ],[ 97 , 对应整个li样式 ],[ 97 , 对应整个li样式 ],[ 97 , 对应整个li样式 ],....]*/// class {}for( var i = 0; i < lis.length; i++){arr.push([])// console.log(arr[i])// console.log( i )arr[i][0] = spanS[i].innerHTML*1;arr[i][1] = lis[i].innerHTML;}// console.log( arr )for( var i = 0; i < btns.length;i++){btns[i].i = i;  // 0 1 btns[i].onclick = function(){oHiden.style.display = 'none'PriceSpan.innerHTML = this.innerHTML;PriceSpan.className = 'red'// console.log( this.i )PriceSort( this.i )}// console.log( i )}//升 ， 降 ？function PriceSort( idx ){// console.log( idx )arr.sort(function(  a , b ){// console.log( a )// 0 : 降// 1 : 升return idx ? a[0] - b[0] : b[0] - a[0]})console.log( arr )con.innerHTML = ''for( var i = 0 ; i <arr.length ; i++){con.innerHTML += "<li>"+ arr[i][1]+"</li>";}}</script>
</body>
</html>

预习：待定

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从零开始学前端：购物车和鲜花价格排序 --- 今天你学习了吗？（JS：Day12）

从零开始学前端：程序猿小白也可以完全掌握！—今天你学习了吗？（JS）

文章目录

前言

第十二节课：购物车和鲜花价格排序的案例

一、购物车

二、鲜花价格排序

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