[当我尝试单击添加到购物车按钮时，它不会添加到我的购物车中。我不知道该如何解决。代码缺少重要的东西吗？我想要它，以便当我单击“添加到购物车”时，将添加一个产品，以便该产品作为添加的商品出现在购物车中。
[这是我正在使用的班级项目
<!DOCTYPE html>
<html lang="en" xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta charset="utf-8">
<title>Printing Prime</title>
<link rel="icon" type="image/png" href="img/favi.png">
<script src="js//bootstrap.min.js"></script>
<script src="js/script.js"></script>
<script src="https://code.jquery.com/jquery-3.4.1.min.js" integrity="sha256-CSXorXvZcTkaix6Yvo6HppcZGetbYMGWSFlBw8HfCJo=" crossorigin="anonymous"></script>
<link href="https://fonts.googleapis.com/css?family=Noto+Sans&display=swap" rel="stylesheet">
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/normalize/5.0.0/normalize.min.css">
<link rel='stylesheet prefetch' href='https://cdnjs.cloudflare.com/ajax/libs/slick-carousel/1.6.0/slick.min.css'>
<link rel='stylesheet prefetch' href='https://cdnjs.cloudflare.com/ajax/libs/slick-carousel/1.6.0/slick-theme.min.css'>
<link rel='stylesheet prefetch' href='https://fonts.googleapis.com/css?family=Roboto+Condensed:100'>
<link rel="stylesheet" type="text/css" href="css/home.css">
<link rel="stylesheet" href="css/splitslick/style.css">
<link rel="stylesheet" href="css/featprod/style.css"
</head>
<body>
<section id="" class="container-fluid cart">
<article id="" class="col">
<span class="open-modal">
<i id="carts" class="fa fa-shopping-cart" data-toggle="modal" data-target="#cart"></i>
</span>
</article>
</section>
<section id="" class="container-fluid">
<article id="" class="row">
<div id="mask"></div>
<div class="modal fade" id="cart" tabindex="-1" role="dialog" aria-labelledby="exampleModalLabel" aria-hidden="true">
<div class="modal-dialog modal-lg" role="document">
<div class="modal-content">
<div class="modal-header">
<h5 class="modal-title" id="exampleModalLabel">Cart</h5>
</div>
<div class="modal-body">
<table class="show-cart table">
</table>
<div>Total price: $<span class="total-cart"></span></div>
</div>
<div class="modal-footer">
<button type="button" class="btn btn-secondary" data-dismiss="modal">Close</button>
<button type="button" class="btn btn-primary">Order now</button>
</div>
</div>
</div>
</div>
</article>
</section>
<section id="products" class="container-fluid">
<article id="" class="row">
<div id="" class="col col-md-12 product-grid">
<div class="col col-md-4 grid-item">
<div>
<div>
<div>
<img style="height: 30vh; width: 15vw;" src="img/hat1.png" alt="Avatar">
<h5 style="color:white;">Sad Face Cap</h5>
<h5 style="color:white;">$12.99</h5>
<div>
<input type="number" placeholder="# of items">
<a href="#" data-name="Sad Face Cap" data-price="12.99" class="add-to-cart btn btn-primary">Add to cart</a>
</div>
</div>
</div>
</div>
</div>
<div class="col col-md-4 grid-item">
<div>
<div>
<div>
<img style="height: 30vh; width: 15vw;" src="img/shirt1.png" alt="Avatar">
<h5 style="color:white;">Signature Tee</h5>
<div>
<input type="number" placeholder="# of items">
<a href="#" data-name="Signature Tee" data-price="14.99" id="submit" class="add-to-cart btn btn-primary">Add to cart</a>
</div>
</div>
</div>
</div>
</div>
<div class=" col col-md-4 grid-item">
<div>
<div>
<div>
<img style="height: 30vh; width: 14vw;" src="img/hoodie1.png" alt="Avatar" >
<h5 style="color:white;">VHS Hoodie</h5>
<div>
<input type="number" placeholder="# of items" >
<a href="#" data-name="VHS Hoodie" data-price="16.99" id="submit" class="add-to-cart btn btn-primary">Add to cart</a>
</div>
</div>
</div>
</div>
</div>
</section>
</body>
</html>
(js)
function openModalBox(){
var modal = $('.modal, #mask');
$('.open-modal').on('click', function() {
modal.fadeIn(300);
});
$('.close-modal, #mask').on('click', function() {
modal.fadeOut(800);
});
}
openModalBox();
var shoppingCart = (function() {
cart = [];
function Item(name, price, count) {
this.name = name;
this.price = price;
this.count = count;
}
function saveCart() {
sessionStorage.setItem('shoppingCart', JSON.stringify(cart));
}
function loadCart() {
cart = JSON.parse(sessionStorage.getItem('shoppingCart'));
}
if (sessionStorage.getItem("shoppingCart") != null) {
loadCart();
}
var obj = {};
obj.addItemToCart = function(name, price, count) {
for(var item in cart) {
if(cart[item].name === name) {
cart[item].count ++;
saveCart();
return;
}
}
var item = new Item(name, price, count);
cart.push(item);
saveCart();
}
obj.setCountForItem = function(name, count) {
for(var i in cart) {
if (cart[i].name === name) {
cart[i].count = count;
break;
}
}
};
obj.removeItemFromCart = function(name) {
for(var item in cart) {
if(cart[item].name === name) {
cart[item].count --;
if(cart[item].count === 0) {
cart.splice(item, 1);
}
break;
}
}
saveCart();
}
obj.removeItemFromCartAll = function(name) {
for(var item in cart) {
if(cart[item].name === name) {
cart.splice(item, 1);
break;
}
}
saveCart();
}
obj.totalCount = function() {
var totalCount = 0;
for(var item in cart) {
totalCount += cart[item].count;
}
return totalCount;
}
obj.totalCart = function() {
var totalCart = 0;
for(var item in cart) {
totalCart += cart[item].price * cart[item].count;
}
return Number(totalCart.toFixed());
}
obj.listCart = function() {
var cartCopy = [];
for(i in cart) {
item = cart[i];
itemCopy = {};
for(p in item) {
itemCopy[p] = item[p];
}
itemCopy.total = Number(item.price * item.count).toFixed(2);
cartCopy.push(itemCopy)
}
return cartCopy;
}
return obj;
})();
$('.add-to-cart').click(function(event) {
event.preventDefault();
var name = $(this).data('name');
var price = Number($(this).data('price'));
shoppingCart.addItemToCart(name, price, 1);
displayCart();
});
$('.clear-cart').click(function() {
shoppingCart.clearCart();
displayCart();
});
function displayCart() {
var cartArray = shoppingCart.listCart();
var output = "";
for(var i in cartArray) {
output += "<tr>"
+ "<td>" + cartArray[i].name + "</td>"
+ "<td>(" + cartArray[i].price + ")</td>"
+ "<td><div class='input-group'><button class='minus-item input-group-addon btn btn-primary' data-name=" + cartArray[i].name + ">-</button>"
+ "<input type='number' class='item-count form-control' data-name='" + cartArray[i].name + "' value='" + cartArray[i].count + "'>"
+ "<button class='plus-item btn btn-primary input-group-addon' data-name=" + cartArray[i].name + ">+</button></div></td>"
+ "<td><button class='delete-item btn btn-danger' data-name=" + cartArray[i].name + ">X</button></td>"
+ " = "
+ "<td>" + cartArray[i].total + "</td>"
+ "</tr>";
}
$('.show-cart').html(output);
$('.total-cart').html(shoppingCart.totalCart());
$('.total-count').html(shoppingCart.totalCount());
}
$('.show-cart').on("click", ".delete-item", function(event) {
var name = $(this).data('name')
shoppingCart.removeItemFromCartAll(name);
displayCart();
})
$('.show-cart').on("click", ".minus-item", function(event) {
var name = $(this).data('name')
shoppingCart.removeItemFromCart(name);
displayCart();
})
$('.show-cart').on("click", ".plus-item", function(event) {
var name = $(this).data('name')
shoppingCart.addItemToCart(name);
displayCart();
})
$('.show-cart').on("change", ".item-count", function(event) {
var name = $(this).data('name');
var count = Number($(this).val());
shoppingCart.setCountForItem(name, count);
displayCart();
});
displayCart();
首先，最后一个链接没有结束>。其次……我不知道。这个对我有用。提示：编写2个代码容器，不要在一个容器中混用javascript和html。
我从您提供的代码段中看到2个问题。
问题1-在加载jquery之前，您正在加载script.js（我假设这是您的页面级脚本代码的位置。）>
解决方案-将jquery引用移至上方，并将script.js引用移至下方。
您的自定义js文件（script.js）
问题2-将脚本代码包装在document.ready函数中。解决方案-
$(document).ready(function() {
//Your script code
})