react课程3-pizza_menu

Last updated on August 13, 2024 pm

记录做出的pizza menu项目,总结一下react 内容。

一、

(1)组件树

image-20240813151436338

(2)JSX与HTML

image-20240813151557741

二、代码

(1)index.css

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
@import url("https://fonts.googleapis.com/css2?family=Roboto+Mono:ital,wght@0,300;0,400;0,500;1,300&display=swap");

* {
margin: 0;
padding: 0;
box-sizing: border-box;
}

html {
font-size: 62.5%;
}

body {
font-family: "Roboto Mono", sans-serif;
color: #252525;
font-weight: 400;
background-color: #f7f2e9;
border-bottom: 1.6rem solid #edc84b;
min-height: 100vh;
padding: 3.2rem;
padding-bottom: 6rem;
}

.container {
max-width: 80rem;
margin: 0 auto;

display: flex;
flex-direction: column;
align-items: center;
gap: 4.8rem;
}

/* *************** */

.header {
align-self: stretch;
}

.header h1 {
/* Non-accessible color */
color: #edc84b;
/* color: #af8602; */

text-transform: uppercase;
text-align: center;
font-size: 5.2rem;
font-weight: 300;
letter-spacing: 3px;
position: relative;
width: 100%;
display: block;
}

.header h1::before,
.header h1::after {
display: block;
content: "";
height: 3px;
width: 4rem;
background-color: #edc84b;
position: absolute;
top: calc(50% - 1px);
}

.header h1::before {
left: 0;
}

.header h1::after {
right: 0;
}

/* *************** */

.menu {
display: flex;
flex-direction: column;
align-items: center;
gap: 4rem;
}

.menu h2 {
display: inline-block;
padding: 1rem 0;
border-top: 2px solid currentColor;
border-bottom: 2px solid currentColor;
font-size: 2.4rem;
text-transform: uppercase;
letter-spacing: 3px;
font-weight: 500;
}

.menu > p {
font-size: 1.5rem;
text-align: center;
line-height: 1.6;
width: 80%;
}

.pizzas {
list-style: none;
display: grid;
grid-template-columns: 1fr 1fr;
gap: 4.8rem;
}

.pizza {
display: flex;
gap: 3.2rem;
}

.pizza img {
width: 12rem;
aspect-ratio: 1;
align-self: start;
}

.pizza div {
display: flex;
flex-direction: column;
gap: 0.8rem;
padding: 0.4rem 0;
}

.pizza h3 {
font-size: 2rem;
font-weight: 400;
}

.pizza p {
font-size: 1.4rem;
font-weight: 300;
font-style: italic;
margin-bottom: auto;
}

.pizza span {
display: block;
font-size: 1.6rem;
}

.pizza.sold-out {
color: #888;
}

.pizza.sold-out img {
filter: grayscale();
opacity: 0.8;
}

/* *************** */

.footer {
font-size: 1.4rem;
}

.order {
display: flex;
flex-direction: column;
align-items: center;
gap: 2.4rem;
}

.btn {
color: inherit;
font-family: inherit;
border: none;
font-size: 1.4rem;
font-weight: 500;
background-color: #edc84b;
padding: 1.4rem 3.2rem;
cursor: pointer;
transition: all 0.2s;
}

.btn:hover {
background-color: #e9bb24;
}

/*
SPACING SYSTEM (px)
2 / 4 / 8 / 12 / 16 / 24 / 32 / 40 / 48 / 64 / 80 / 96 / 128

FONT SIZE SYSTEM (px)
10 / 12 / 14 / 16 / 18 / 20 / 24 / 30 / 36 / 44 /52 / 62 / 74 / 86 / 98
*/

(2)index.js

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
import React from "react";
import ReactDOM from "react-dom/client";
import "./index.css";

const pizzaData = [
{
name: "Focaccia",
ingredients: "Bread with italian olive oil and rosemary",
price: 6,
photoName: "pizzas/focaccia.jpg",
soldOut: false,
},
{
name: "Pizza Margherita",
ingredients: "Tomato and mozarella",
price: 10,
photoName: "pizzas/margherita.jpg",
soldOut: false,
},
{
name: "Pizza Spinaci",
ingredients: "Tomato, mozarella, spinach, and ricotta cheese",
price: 12,
photoName: "pizzas/spinaci.jpg",
soldOut: false,
},
{
name: "Pizza Funghi",
ingredients: "Tomato, mozarella, mushrooms, and onion",
price: 12,
photoName: "pizzas/funghi.jpg",
soldOut: false,
},
{
name: "Pizza Salamino",
ingredients: "Tomato, mozarella, and pepperoni",
price: 15,
photoName: "pizzas/salamino.jpg",
soldOut: true,
},
{
name: "Pizza Prosciutto",
ingredients: "Tomato, mozarella, ham, aragula, and burrata cheese",
price: 18,
photoName: "pizzas/prosciutto.jpg",
soldOut: false,
},
];
//整个应用界面
function App() {
return (
<div className="container">
<Header />
<Menu />
<Footer />
</div>
);
}

function Header() {
//const style = { color: "red", fontSize: "48px", textTransform: "uppercase" };
return (
<header className="header">
<h1>Fast React Pizza Co.</h1>
</header>
);
}

function Menu() {
const pizzas = pizzaData;
//const pizzas = [];
const numPizzas = pizzas.length;
return (
<main className="menu">
<h2>Our menu</h2>

{numPizzas > 0 ? (
<>
<p>
Authentic Italian cuisine.6 creative dishes to choose from. All from our stone oven,all organic,all delicious.
</p>
<ul className="pizzas">
{pizzaData.map((pizza) => (
<Pizza pizzaObj={pizza} key={pizza.name} />
))}
</ul>
</>
) : (
<p>we're still work on our menu,please come back later :)</p>
)}
</main>
);
}

function Pizza({ pizzaObj }) {
//if (pizzaObj.soldOut) return null;
return (
<li className={`pizza ${pizzaObj.soldOut ? "sold-out" : ""}`}>
<img src={pizzaObj.photoName} alt={pizzaObj.name} />
<div>
<h3>{pizzaObj.name}</h3>
<p>{pizzaObj.ingredients}</p>
<span>{pizzaObj.soldOut ? "SOLD OUT" : pizzaObj.price}</span>
</div>
</li>
);
}

function Footer() {
const hour = new Date().getHours();
const openHour = 12;
const closeHour = 19;
const isOpen = hour >= openHour && hour <= closeHour;
return (
<footer className="footer">
{isOpen ? (
<Order closeHour={closeHour} />
) : (
<p>
we're happy to welcome you between {openHour}:00 and {closeHour}:00
</p>
)}
</footer>
);
}

function Order (props) {
console.log(props);
return (
<div className="order">
<p>
we're open until {props.closeHour}:00.Come visit us or order unline.
</p>
<button className="btn">Order</button>
</div>
);
}

const root = ReactDOM.createRoot(document.getElementById("root"));
root.render(<App />);
/*strict : can check bug
root.render(
<React.StrictMode>
<App />
</React.StrictMode>
);*/

三、Summary

(1)map

(2)?:

(3)fragment

(4)render

(5)destrcution and props

(6)条件展示css

(7)emoji网站:https://emojipedia.org/


react课程3-pizza_menu
http://example.com/2024/08/13/react课程3-pizza_menu/
Author
Yaodeer
Posted on
August 13, 2024
Licensed under