JS实现购物车基本功能

$(function(){
 
 $("#footer").hover(function(){
 $("#footer").css({"border":"#e00"})
 },)
 
 var inputs=document.getElementsByName("good-id");
 var all=document.getElementsByName("all")[0];
 
 all.onclick=function(){
 for(var i=0;i<inputs.length;i++){
 inputs[i].checked=this.checked;
 }
 sumprice();
 }
 
 for(var i=0;i<inputs.length;i++){
 inputs[i].onclick=function(){
 var count=0;
 for(var j=0;j<inputs.length;j++){
 if(inputs[j].checked==true){
 count++
 }
 }
 if(count<inputs.length){
 all.checked=false;
 }else{
 all.checked=true;
 }
 sumprice();
 }
 }
 
 //减少
 var minus=document.getElementsByName("minus");
 for(var i=0;i<minus.length;i++){
 minus[i].onclick=function(){
 var counts=this.nextElementSibling;
 var count=parseInt(counts.value);
 if(count>1){
 counts.value=--count;
 }
 sumprice();
 }
 }
 //增加
 var plus=document.getElementsByName("plus");
 for(var i=0;i<plus.length;i++){
 plus[i].onclick=function(){
 var counts=this.previousElementSibling;
 var count=parseInt(counts.value);
 counts.value=++count;
 sumprice();
 }
 }
 
 //手动输入
 var counts=document.getElementsByName("count");
 for(var i=0;i<counts.length;i++){
 counts[i].onblur=function(){
 var count=parseInt(this.value);
 if(isNaN(count)||count<1){
 count=1;
 }
 this.value=count;
 sumprice();
 }
 }
 
 
 //计算
function sumprice() {
 var tbody = document.getElementById("cart-goods-list");
 var tbodyTr = tbody.getElementsByTagName("tr");
 var sumprice=0;
 for(var i = 0; i < tbodyTr.length; i++) {
 //获取单价
 var priceEm = tbodyTr[i].getElementsByClassName("price-em")[0];
 var price = parseFloat(priceEm.innerText);

 //获取数量
 var counts = tbodyTr[i].getElementsByClassName("combo-value")[0];
 var count = parseInt(counts.value);
 //乘积
 var chengji=price*count;
 //把乘积弄到金额里面
 var amountEm=tbodyTr[i].getElementsByClassName("amount-em")[0];
 amountEm.innerText=chengji.toFixed(2);
 
 //获取单选框
 var liD=tbodyTr[i].getElementsByTagName("input")[0];
 if(liD.checked){
 sumprice+=chengji;
 }
 }
 var zong=document.getElementById("total-amount-em");
 zong.innerText=sumprice.toFixed(2);
}
 
 //删除
 document.getElementById("cart-delete").onclick=function(){
 var tbody = document.getElementById("cart-goods-list");
 var del=[];
 for(var i=0;i<inputs.length;i++){
 if(inputs[i].checked){
 del.push(inputs[i].parentElement.parentElement);
 }
 }
 for(var i=0;i<del.length;i++){
 tbody.removeChild(del[i]);
 }
 all.checked=false;
 sumprice();
 }
 
 document.getElementById("total-amount").onmouseover=function(){
 document.getElementById("total-amount").style.cursor="pointer";
 }
 
 document.getElementById("total-amount").onclick=function(){
 var tbody = document.getElementById("cart-goods-list");
 var tr=document.createElement("tr");
 tr.innerHTML='<tr><td><input type="checkbox" name="good-id" value="1"></td><td class="goods"><div class="goods-image"><img src="/UploadFiles/2021-04-02/1.jpg">


CSS代码




@charset "utf-8";

#main{
 padding: 30px 0px;
}

#cart{
 background: #FFFFFF;
 padding: 40px;
}

#cart h1{
 line-height: 40px;
 padding: 0px 0px 10px 0px;
}

table.form{
 border-collapse: collapse;
 empty-cells: show;
 margin: 20px 0px;
 padding: 0px;
 table-layout: fixed;
 width: 100%;
}

table.form th,
table.form td{
 border-bottom: 1px solid #DDDDDD;
 padding: 15px 10px;
 text-align: left;
}

table.form{
 border-top: 3px solid #DDDDDD;
}

.goods .goods-image img{
 border: 1px solid #DDDDDD;
 float: left;
 height: 100px;
 margin: 0px 20px 0px 0px;
}

.goods .goods-information{
 float: left;
}

.goods .goods-information ul{
 color: #666666;
 font-size: 12px;
 line-height: 20px;
 margin:10px 0px 0px 0px;
}

.price,
.amount,
#total-amount{
 color: #E00000;
}

#total-amount{
 font-size: 22px;
}

.price em,
.amount em,
#total-amount em{
 font-style: normal;
}

.combo .combo-minus,
.combo .combo-value,
.combo .combo-plus{
 background: #FFFFFF;
 border: 1px solid #DDDDDD;
 color: #333333;
 float: left;
 font-weight: bold;
 margin: 0px;
 outline: none;
 text-align: center;
}

.combo .combo-minus,
.combo .combo-plus{
 font-size: 16px;
 height: 26px;
 line-height: 26px;
 padding: 0px;
 width: 24px;
}

.combo .combo-value{
 border-left: none;
 border-right: none;
 height: 20px;
 line-height: 20px;
 padding: 2px;
 width: 40px;
}

#cart-delete{
 margin-left: 20px;
}

#settlement{
 background: #E00000;
 border: none;
 color: #FFFFFF;
 float: right;
 font-size: 16px;
 height: 40px;
 line-height: 40px;
 margin: 0px;
 outline: none;
 padding: 0px;
 width: 160px;
}


HTML代码




<!DOCTYPE html>
<html>
 <head>
 <meta charset="utf-8">
 <title>商城</title>
 <link rel="stylesheet" href="./css/common.css" rel="external nofollow" >
 <link rel="stylesheet" href="./iconfont/iconfont.css" rel="external nofollow" >
 <link rel="stylesheet" href="./css/cart.css" rel="external nofollow" >
 <script type="text/javascript" src="/UploadFiles/2021-04-02/jquery-3.1.1.js">

注：CSS样式代码由于太多上面没有给全，只给了主要代码。小伙伴们可以根据实际情况修改样式。
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。