react-redux 相关问题

产品卡函数 ProductCard ({图像, 名称, 统计信息, id}){ 让调度 = useDispatch() 让数量 = 1 返回（ <> 产品卡 function ProductCard ({image, name, stats, id}){ let dispatch = useDispatch() let quantity = 1 return ( <> <div className="product-card"> <div className="product-image-wrapper"> <img src={image} alt="" /> </div> <div className="image-metadata"> <div className="data-wrapper"> <div className="product-details"> <div className="product-category">{stats.category}</div> <div className="product-name">{name}</div> </div> <div className="action-btn-wrapper"> <div className="add-to-cart" onClick={()=>{ dispatch(addToCart({name,image,stats,id,quantity})) } }> <img src={addToCartIcon} alt="" /> </div> </div> </div> </div> </div> </> ) } CART 组件 import React, { useEffect } from "react"; import Header from "../components/header"; import Footer from "../components/footer"; import Checkout from "../components/checkout"; import { useSelector } from "react-redux"; function Cart (){ let cartCount = useSelector(state => state.cart.cart) useEffect(()=>{ document.title = `TRAX- Cart(${cartCount.length} Items)` },[cartCount]) return ( <> <Header/> <Checkout/> <Footer/> </> ) } export default Cart; 结帐组件 import React from "react"; import cartImage from '../assets/website-icons/9026048_shopping_cart_simple_icon.svg' import productImage from '../assets/featured/chair-model.jpg' import arabicImage from '../assets/featured/arabic-model.jpg' import { useSelector } from "react-redux"; import CartItem from "../widgets/cartItem"; function Checkout(){ let cartCount = useSelector(state => state.cart.cart) return ( <div className="cart-wrapper"> <div className="cart-page-icon"> <div className="icon-container"> <img src= {cartImage} alt="Shopping Cart Icon" /> {/* CART */} </div> </div> <div className="mini-slogan-wrapper"> Shop for upto $200 to enjoy<span>FREE SHIPPING</span>. </div> <div className="cart-table-content"> <div className="cart-table"> <div className="table-cell header-cell"> <div className="table-col-1">Product</div> <div className="table-col-2">Quantity</div> <div className="table-col-3">Price</div> <div className="table-col-4">Subtotal</div> </div> { cartCount.map(({name,image,stats,id,quantity}) => { return <CartItem id={id} productImage={image} quantity={quantity} productStats={{category : stats.category, color : stats.color}} productName={name}/> }) } {/* <div className="table-cell"> <div className="table-col-1"> <div className="product-entry"> <div className="product-image"> <img src={productImage} alt="" /> </div> <div className="product-description"> <div className="product-name">Sunny T-Shirt Merch By Zomato</div> <div className="product-extras">Color: Red, Size : XL, Fabric : Cotton</div> <div className="product-remove-btn">Remove</div> </div> </div> </div> <div className="table-col-2"> <div className="quantity-adjuster"> <div className="decrementor"> <img src={decrementor} alt="" /> </div> <div className="quantity-value">1</div> <div className="incrementor"> <img src={incrementor} alt="" /> </div> </div> </div> <div className="table-col-3">$300</div> <div className="table-col-4">$300</div> </div> <div className="table-cell"> <div className="table-col-1"> <div className="product-entry"> <div className="product-image"> <img src={arabicImage} alt="" /> </div> <div className="product-description"> <div className="product-name">Arabic Scarf - Embroidery Print</div> <div className="product-extras">Color: Mehroon, Size : Standard, Fabric : Linen</div> <div className="product-remove-btn">Remove</div> </div> </div> </div> <div className="table-col-2"> <div className="quantity-adjuster"> <div className="decrementor"> <img src={decrementor} alt="" /> </div> <div className="quantity-value">1</div> <div className="incrementor"> <img src={incrementor} alt="" /> </div> </div> </div> <div className="table-col-3">$120</div> <div className="table-col-4">$120</div> </div> */} </div> <div className="checkout-container"> <div className="checkout-heading"> Cart Summary </div> <div className="selection-group"> <div className="selection-option"> <div className="selection-indicator-wrapper"> <div className="selection-ball"></div> </div> <div className="selection-value">Regular Shipping</div> <div className="selection-cost">$12.00</div> </div> <div className="selection-option"> <div className="selection-indicator-wrapper"> <div className="selection-balls"></div> </div> <div className="selection-value">Express Shipping</div> <div className="selection-cost">20.00</div> </div> </div> <div className="checkout-secondary-row" id="checkout-subtotal"> <div className="heading-secondary-row">Subtotal</div> <div className="cost-secondary-row">$420</div> </div> <div className="checkout-secondary-row" id="checkout-tax"> <div className="heading-secondary-row">Tax</div> <div className="cost-secondary-row">$10</div> </div> <div className="checkout-total" id="checkout-total" > <div className="heading-total">Total</div> <div className="cost-total">$430</div> </div> <div className="checkout-btn">Checkout</div> </div> </div> </div> ) } export default Checkout; 购物车商品组件 import React from "react"; import decrementor from '../assets/website-icons/decrementor.svg' import incrementor from '../assets/website-icons/incrementor.svg' import { useDispatch } from "react-redux"; import { removeFromCart,incrementQty,decrementQty } from "../state-manager/Slices/cartSlice"; function CartItem ({productImage,productName, productStats,id,quantity}){ let dispatch = useDispatch() return ( <div className="table-cell"> <div className="table-col-1"> <div className="product-entry"> <div className="product-image"> <img src={productImage} alt="" /> </div> <div className="product-description"> <div className="product-name">Sunny T-Shirt Merch By Zomato</div> <div className="product-extras">Color:{productStats.color}, Size : XL, Fabric : Cotton</div> <div className="product-remove-btn" onClick={()=>{ dispatch(removeFromCart({productImage,productName,productStats,id})) }}>Remove</div> </div> </div> </div> <div className="table-col-2"> <div className="quantity-adjuster"> <div className="decrementor" onClick={()=>{ dispatch(decrementQty({id})) }}> <img src={decrementor} alt="" /> </div> <div className="quantity-value">{quantity}</div> <div className="incrementor" onClick={()=>{ dispatch(incrementQty({id})) }}> <img src={incrementor} alt="" /> </div> </div> </div> <div className="table-col-3">${300}</div> <div className="table-col-4">${quantity * 300}</div> </div> ) } export default CartItem; 卡片切片 import { createSlice } from "@reduxjs/toolkit" let CartSlice = createSlice({ name : 'Cart', initialState : { cart : [], checkoutTotal : 0 }, reducers : { addToCart : (state,action)=>{ if(state.cart.length < 1){ state.cart = [...state.cart, action.payload] }else { state.cart.map(item => { if(item.id == action.payload.id){ item.quantity++; }else { state.cart = [...state.cart, action.payload] } }) } }, removeFromCart : (state,action)=>{ state.cart.map((item, index, cartItemArray) =>{ if(item.id == action.payload.id){ let rar = cartItemArray.splice(index,1) console.log(rar) } }) }, incrementQty : (state,action)=>{ state.cart.map(item =>{ console.log(action.payload) if(item.id == action.payload.id){ item.quantity = item.quantity + 1 } }) }, decrementQty : (state,action)=>{ state.cart.map(item =>{ if(item.id == action.payload.id){ if(item.quantity > 0){ item.quantity = item.quantity - 1 }else { console.log('its already nulled out') } } }) } } }) export default CartSlice.reducer export const {addToCart,removeFromCart, incrementQty,decrementQty} = CartSlice.actions 我正在使用 redux 进行状态管理，每当我添加到购物车时，第三次单击时，购物车计数开始加倍，例如从 2 到 4，从 4 到 6 等等，我已经尝试了很多，但我不能我的头围绕着它。请让我知道我做错了什么？发生这种情况是因为您循环遍历购物车中的所有商品，并且对于每个商品，您将整个购物车附加到 cart 中。您需要做的是将现有商品替换为相同商品但数量不同。像这样的东西： state.cart.map(item => item.id == action.payload.id ? {...item, quantity: item.quantity + 1 } : item); 我无法测试代码，但我希望它至少能帮助您找出问题。如果这有帮助，请告诉我。

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